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

<passage>:
Revolt was brewing on Venus, led by the outskirts of the native city, dimly visible through the ever-present Venusian mist. The native guard of honor, posted a hundred yards from the Earth-ship, stood stolidly at attention with their old-fashioned proton-rifles slung over their backs. A few natives were gazing wonderingly at the great ship, but made no move to pass the line of guards. is—right down into the mud. Well—" he laughed—"maybe they will. After all, the fittest survive. That's a basic law of—" The annunciator over the open lock clanged vigorously, and a metallic voice rasped: "Officer of the Deck! Post Number One! Instruments reports a spy ray focused on the main lock!" Earth-ship returns, it means disaster for Venus. Therefore, it must not Earth." "Never get back to Earth?" the old man gasped. "Has the Council authorized—murder?" Earth-ship has." He paused dangerously. "Toller," he said, "do you object?" Svan smiled, and it was like a dark flame. He reached to a box at his feet, held up a shiny metal globe. "One of us will plant this in the ship. It will be set by means of this dial—" he touched a spot on the surface of the globe with a pallid finger—"to do nothing for forty hours. Then—it will explode. Atomite." "We will let chance decide who is to do the work," he said angrily. "Is there anyone here who is afraid? There will be danger, I think...." No answer. Svan jerked his head. "Good," he said. "Ingra, bring me that bowl." Silently the girl picked up an opaque glass bowl from the broad arm of her chair. It had held Venus-tobacco cigarettes creasing the six fatal slips. He dropped them in the bowl, stirred it with his hand, offered it to the girl. "You first, Ingra," he said. Svan, too, had left his unopened. He sat at the table, facing them. "This is the plan," he said. "We will go, all six of us, in my ground car, to look at the Earth-ship. No one will suspect—the whole city has been to see it already. One will get out, at the best point we can a hysterical woman, a few screams, that's all there is to it. And the sixth person will have his chance to steal to the side of the ship. The bomb is magnetic. It will not be noticed in the dark—they will take off before sunrise, because they must travel away secret. His voice was very tired as he said, "I will plant the bomb." The six conspirators in Svan's old ground car moved slowly along the main street of the native town. Two Earth-ship sailors, unarmed except for deceptively flimsy-looking pistols at their hips, stood before the entrance to the town's Hall of Justice. brakes. A Venusian in the trappings of the State Guard advanced on them from the side of the road, proton-rifle held ready to fire again. "Where are you going?" he growled. Svan spoke up. "We want to look at the Earth-ship," he said. He opened the door beside him and stepped out, careless of the drizzle. "We heard it was leaving tonight," he continued, "and we have not seen it. Is that not permitted?" The guard shook his head sourly. "No one is allowed near the ship. The order was just issued. It is thought there is danger." Svan stepped closer, his teeth bared in what passed for a smile. "It He strove instinctively to bring the clumsy rifle up, but Svan was faster. His gamble had failed there was only one course remaining. He hurled his gross white bulk at the guard, bowled him over against the splintery logs of the road. The proton-rifle went flying, and Svan savagely tore at the throat of the guard. Knees, elbows and claw-like nails—Svan battered at the astonished man with every ounce of strength in his body. The guard was as big as Svan, but Svan had the initial advantage ... and it was only a matter of seconds before the guard lay unconscious, his skull a mass of gore at the back where Svan had ruthlessly pounded it against the road. Svan rose, panting, stared around. No one else was in sight, save the petrified five and the ground car. Svan glared at them contemptuously, then reached down and heaved on the senseless body of the guard. Over the shoulder of the road the body went, onto the damp swampland of the jungle. Even while Svan watched the body began to sink. There would be a watch for other guards." Venus has no moon, and no star can shine through its vast cloud layer. Ensign Lowry, staring anxiously out through the astro-dome in the bow of the Earth-ship, cursed the blackness. The Exec looked up wearily. He shrugged. "Probably the guards. Of course, you can't tell. Might be a raiding party." "And how do you know the guards themselves don't belong to it?" the out now. Must have been the guard. They're on the wrong side to be coming from the town, anyhow...." under the seat. If he took a little longer than seemed necessary to get the atomite bomb out of the compartment, none of the others noticed. Certainly it did not occur to them that there had been bombs in the compartment, though Svan's hand emerged with only one. He got out of the car, holding the sphere. "This will do for me," he said. "They won't be expecting anyone to come from behind the ship—we were wise to circle around. Now, you know what you must do?" It's not much of a plan. The guards would the bomb will not explode until the ship is far out in space. Remember, you are in no danger from the guards." From the guards that bomb in the compartment, they would merely be obliterated in a ground-shaking crash. Abruptly he swallowed, reminded of the bomb that was silently counting jungle plants thinned out. Ahead, on an elevation, were the rain-dimmed lights of the Earth-ship, set down in the center of a clearing made by its own fierce rockets. Svan's mist-trained eyes spotted the circling figures of sentries, and knew that these would be the ship's own. They would not be as easily overcome as the natives, not with those slim-shafted blasters they carried. Only deceit could get him to the side of the ship. Svan settled himself at the side of the road, waiting for his chance. turned it over without looking at it, wondering who had drawn the first cross, and been a coward. Ingra? One of the men? He became abruptly conscious of a commotion behind him. A ground car of its blinding driving-light, as it bumped to a slithering stop. Paralyzed, he heard the girl's voice. "Svan! They're coming! They found the guard's rifle, and they're looking for us! Thirty Earthmen, Svan, with those frightful guns. They fired at us, but we got away and came for you. We must flee!" halves of a metallic sphere. Dangling ends of wires showed where a connection had been broken. "He had a bomb," he said. "A magnetic-type, delayed-action atomite bomb. There must have been another in the car,

<question>:
What object is found by the guards, giving away the six Venusian conspirators? Who does it belong to?

<options>:
A A spy ray. It belongs to the six insurgents who plan to blow up the Earth ship.
B A Venus-tobacco cigarette. It belongs to the Exec officer, who the six insurgents killed when breaking into the Earth ship.
C An atomite bomb. It belongs to the guard they killed just before breaking into where the Earth ship is kept.
D A rifle. It belongs to the guard they killed just before breaking into where the Earth ship is kept.

<answer>:

D