Read the following passage and questions, then choose the right answer from options, the answer should be one of A, B, C, D.

<passage>:
Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.] A Konv cylinder was the key to space—but They were able to make ends meet. Her neighbors knew nothing of the money she had brought with her to Agents had killed her husband. "There goes one of the old-fashioned ones. That hair-do was popular back in the sixties." They did not suspect that she did this only to cover the thin, pencil-line scar, evidence that a small cylinder lay under her skin behind the ear. For Mrs. Jamieson was one of the Konvs. Her husband had been one of the small group who developed this tiny instrument. Not the inventor— his name was Stinson, and the effects it resembled a small semi-conductor device. Analysis by the best scientific minds proved it to be a semi-conductor. Yet it held the power to move a body instantly from one point in space to any other point. Each unit was custom built, keyed to operate only by the thought pattern of the particular individual. Konvs, and had been tempted to identify herself and say, "Here I am. stayed in one of her cabins. She learned that he was an Agent completely by accident. While cleaning the cabin one morning his badge fell out of a shirt pocket. She stood still, staring at the horror of it there on the floor, the shirt in That night she soundlessly lifted the screen from the window over his bed and shot him with a .22 rifle. She threw the weapon into the river. It helped very little. He was one Agent, only one out of all the thousands of Agents all over Earth Together they would seek revenge. He did not have the cylinder—not yet. But he would. The Konvs took care of their own. Her husband had been one of the first, and they would not forget. One patch of gauze would be behind his ear. She would shield him until the opening healed. Then no one would ever know, because now they could do it without leaving the tell-tale scar. Then they would seek revenge. Later they would go to Alpha Centaurus, where a life free from Agents Apparently they did not miss him. Mrs. Jamieson handed him a pair of trousers. "Here, get yourself dressed. Then we'll talk." Suddenly his face paled and he stopped in the act of getting into his trousers. "Guess I know now. They made me a Konv." "Well, don't take on so. You'll get used to it." "But they shouldn't have! They didn't even ask me!" Jersey, holding in his hand a small cylinder moulded from silicon with controlled impurities. He had made it, looking for a better regarding the strange power of his device. He tried it again, secretly. Then he made more cylinders. He was the only man in the world who knew how to construct it, and he kept the secret, giving cylinders to selected people. He worked out the basic principle, calling it a the Agent was found strangled to death in his bed. This set off a campaign against Konvs. One base act led to another, until the original reason for noticing them at all was lost. Normal men no longer thought of them as human. when he arrived. But he did arrive, and it was what he had sought. He returned for the others. They gathered one night in a dirty, broken-down farmhouse in Missouri—and disappeared in a body, leaving the Agents standing helplessly on Earth, shaking their fists at the sky. the escape Everybody says, 'Konv' as if it is something dirty. They write it on "Of course they do—because they don't understand! They are afraid of us. Wouldn't you be afraid of someone who could do the things we do, if you couldn't the initial shock wore off he might experiment with his new power. He would not travel far, in these first attempts. Probably he would stay within walking distance of his clothes, because he still lacked the tricks others had learned. knew the habits of Agents. She knew how to avoid them. They would select a spot sufficiently remote to insure detection, she would devise some prank to irritate the Agents then they would quickly swear and drive back to their offices to dig through files, searching for some clue to their identity. themselves. These could be identified, if caught on their detectors, and even recorded for the files. But the files proved confusing, for had more serious problems. Stinson had selected only the best of the Konvs when he left Earth, leaving all those with criminal tendencies behind. They could have followed if they chose—what could stop them? But it was more lucrative to stay. On Earth they could rob, loot, even murder—without fear of the law. Agents" now with a curl of his lip. They had been successful in contacting other Konvs, and sometimes visited them at a remote She did not mention her secret hope, that before they left Earth he would have fully avenged his father's death. He was clever and intelligent. He could kill many Agents. So she exhumed the money she had hidden more than ten years before. It was also convenient for coming home late at night after Agent hunting. one of them—a lean, cunning jaguar facing a fat, lazy bear. It was her notion that federal Agents were evil creatures, tools of a decadent, are always having," she said. "There will be no friends," he answered, "not here. No Konvs will be at likely that Konvs will be found here." He shook his head. "No. They knew we were coming, and no one said a word about others being here. I'm afraid we are alone." You are a Konv. You always will be a Konv. bedroom. He did not mention his frustrated desires to be normal, not after the first attempt, but he persisted in his efforts to be so. Use of the cylinder was out of the question for them now, anyway. papers daily for some word of Konvs being killed. The second day after his disappearance she found a small item. A Konv had raided the Agent's office in Stockholm, killing three, and getting "Tell me what happened! If an Agent saw you ... well, either he killed the names. He asked where I lived. 'None of your damn business,' I told him. Then he said he didn't blame me for not telling, that Konvs must fear Agents, and hate them. Then he said, 'Do you know why we kill Konvs? We kill them because there is no prison cell in the world that will hold a Konv. When they break the law, we have no choice. It is a terrible thing, but must be done. We don't want your secret we only will learn the truth about the Agents." in ten years they might be scattered all over Earth. In the killing of Konvs, some cylinders might even be taken by Agents—and used by them, for the power and freedom the cylinders gave must be coveted even by them. cylinder and were now Konvs themselves. killed by a Konv. The assassin's identity was unknown, but agents were working on the case. She knew. She had found a gun in Earl's desk. will suspect me. His name was on the list." "They will," she agreed. "It doesn't matter who the Konv is, now that an Agent has been killed. The one in Bangkok will tell them about you "Well, what else can he do?" Earl asked. "After all, he is an Agent. "They won't find us." "Oh, yes they will," she said. "Don't underestimate them. Agents are picked from the most intelligent people on Earth. It will be a small job for them. Don't forget they know who you are. Even if you hadn't been so stupid as to tell them, they'd know. They knew my pattern from the time your father was alive. They got yours when we were together Earth with those new detectors, until they pick up your pattern or Agents have their machines working at top speed, while we sit here and talk." Suddenly they were not alone. "By mistake. Back in those days, like now, there were good Konvs and The Agents stepped into the room over the broken door. She stared at them, then ran to Earl's desk, fumbling for the gun. The Agents' guns rattled.

<question>:
In what ways are the Agents able to track Konv?

<options>:
A Infrared tracking machines
B They can monitor brain waves
C They are able to travel through recent teleportation tracks behind the Konv
D They have no special equipment other than pistols

<answer>:

B