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

<passage>:
to give him the key to the ancient city of Kal-Jmar—a city of untold wealth, and of robots that made desires instant commands. [Transcriber's Note: This etext was produced from Planet Stories Winter 1944. Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.] Above, the city's multicolored lights were reflected from the translucent Dome—a distant, subtly distorted Lillis, through which the stars shone dimly. after his ship had crashed in the Mare Cimmerium. But the rest would not be so simple. He had to acquire a spaceman's identity card, and he crashed, illegally-armed ship would have told them that. But they platform, and saw the bright-blue pinpoint of Earth. The sight stirred a touch of nostalgia in him, as it always did, but he put it aside. They got off at the amusement level, three tiers down, and found a he'd find a freighter berth—in as big a spaceport as Lillis, there need a guide. D'you know this part of Mars well?" "Sure," said Syme absently. Out in the center of the floor, an AG plate had been turned on. Five Venusian girls were diving and twisting in its influence, propelling themselves by the motion of their delicately-webbed feet and trailing long gauzy streamers of synthesilk after them. Syme watched them through narrowed lids, feeling the glow of culcha inside him. "I wanta go to Kal-Jmar," said Tate. Syme snapped to attention, every nerve tingling. An indefinable sense, a hunch that had served him well before, told him that something big was coming—something that promised adventure and loot for Syme Rector. "Why?" he asked softly. "Why to Kal-Jmar?" Harold Tate told him, and later, when Syme had taken him to his rooms, right it was big. Kal-Jmar was the riddle of the Solar System. It was the only remaining city of the ancient Martian race—the race that, legends said, had risen to greater heights than any other Solar culture. The machines, the artifacts, the records of the Martians were all there, perfectly preserved inside the city's bubble-like dome, after God knew how many thousands of years. But they couldn't be reached. For Kal-Jmar's dome was not the thing of steelite that protected Lillis: it was a tenuous, globular field of force that defied analysis as it defied explosives and diamond drills. The field extended both above and below the ground, and tunneling was of no avail. No one knew what had happened to the Martians, whether they were the ancestors of the present decadent Martian race, or a different species. No one knew anything about them or about Kal-Jmar. In the early days, when the conquest of Mars was just beginning, Earth scientists had been wild to get into the city. They had observed it from every angle, taken photographs of its architecture and the robots Later, however, when every unsuccessful attempt had precipitated a bloody uprising of the present-day Martians—resulting in a rapid dwindling of the number of Martians—the Mars Protectorate had stepped Earthman to go near the place. Tate, a physicist, had stumbled on a field that seemed to be identical in properties to the Kal-Jmar dome and what is more, he had found a force that would break it down. And so he had made his first trip to Mars, and within twenty-four "They're unpredictable," Syme told him. "They're built differently, and they think differently. They breathe like us, down in their caverns where there's air, but they also eat sand, and get their oxygen that hill country in the distance. "Not only that," he continued. "They eat the damndest stuff. Lichens and fungi and tumble-grass off the deserts—all full of deadly poisons, from arsenic up the line to xopite. They seem intelligent enough—in their own way—but they never come near our cities and they either can't or won't learn Terrestrial. When the first colonists came here, they had to learn their might The hills were much closer than they had seemed, because of Mars' deceptively low horizon. In half an hour they were in the midst of a wilderness of fantastically eroded dunes and channels, laboring on on the other side. as they descended. "Good. I shouldn't like to stay down here for the rest of my natural life. Depressing view." He looked up at the narrow strip of the ground immediately to their left. Syme looked. "Those," he said bitterly, "are Martians." The natives, like all Martian fauna, were multi-legged. Also like all Martian fauna, they moved so fast that you couldn't see how many legs they did have. Actually, however, the natives had six legs apiece—or, more properly, four legs and two arms. Their lungs were not as large Their faces were vaguely canine, but the foreheads were high, and the helped to take care of the extremes of Martian temperature. Right now they were mostly black. The natives slowed down and spread out to surround the wrecked sand Martians. One Martian, who looked exactly like all the rest, stepped forward and The Martian leader looked at them enigmatically, then turned and along under the weak gravity. and more solid. Finally, when Syme estimated they were about nine "Yes, there is air here," said the Martian leader, startlingly. "Not "We had our reasons for not doing so," the Martian said. "But how—?" "We are telepaths, of course. On a planet which is nearly airless on its surface, we have to be. A tendency of the Terrestrial mind is to several thousand years." "No," the Martian interrupted him, "revealing the extent of our civilization would have spared us nothing at your people's hands. Yours is an imperialist culture, and you would have had Mars, whether you thought you were taking it from equals or not." Unfortunately, you must die." the Martians from knowing about it? Then he realized that the Martian "You were brought here for that purpose. It is part of our conception Syme noticed that the other Martians had retired to the farther side of the cavern. Some were munching the glowing fungus. That left only the unconcerned, but his hands were trembling slightly. "First why—" he began. "There are many secrets in Kal-Jmar," the Martian said, "among them a very simple catalyzing agent which could within fifty years transform Mars to a planet with Terrestrially-thick atmosphere." all along, but so far the problem has us licked. If we solved it, then we'd have all of Mars, not just the cities. Your people would die out. You couldn't have that, of course." He sighed deeply. He spread his gloved hands before him and looked at them with a queer intentness. "Well—how about the Martians—the Kal-Jmar Martians, I mean? I'd dearly love to know the answer to that one." "Neither of the alternatives in your mind is correct. They were not a separate species, although they were unlike us. But they were not our ancestors, either. They were the contemporaries of our ancestors." "Several thousand years ago Mars' loss of atmosphere began to make itself felt. There were two ways out. Some chose to seal themselves into cities like Kal-Jmar our ancestors chose to adapt their bodies to the new conditions. Thus the race split. Their answer to the problem its slaves. They died of a plague—and other causes. "And yet," Tate mused, "you are being destroyed by contact with "We hope to win yet," the Martian said. "Will our two races ever live together in amity?" The Martian lowered his head. "That is for unborn generations." He Martian. It was like tangling with a draft horse. The Martian was astonishingly feel the Martian's telepathic call for help surging out. He heard the

<question>:
Which planets have living populations on them from descriptions in the story?

<options>:
A Mars, Venus, Earth
B Mars, Earth
C Mars, Venus
D Earth, Kal-Jmar, Venus

<answer>:

A