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

<passage>:
Doorway to Kal-Jmar Kal-Jmar—a city of untold wealth, and of Planet Stories Winter 1944. Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.] himself off as an itinerant prospector and gain entrance to the city, after his ship had crashed in the Mare Cimmerium. But the rest would of the city, and the curved dome that kept air in Lillis was close overhead. Syme looked up, after his first appraising glance about the 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. The boy was hunched over the circular balustrade a little distance were always jobs open. Meanwhile, he might as well enjoy himself, and it was safer to be seen with a companion than to be alone. He listened lazily to what the other was saying, leaning his tall, "I wanta go to Kal-Jmar," said Tate. "Why?" he asked softly. "Why to Kal-Jmar?" 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 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 had tried everything they knew to pierce the wall. 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 in and forbidden any further experiments Earthman to go near the place. Thus matter had stood for over a hundred years, until Harold Tate. in properties to the Kal-Jmar dome force that would break it down. And so he had made his first trip to Mars, and within twenty-four hours, by the blindest of chances, blurted out his secret to Syme it was carefully, studiedly mild. "Why. Are they really dangerous?" "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 way." "Yes, I've heard about that," Tate said. "Iron oxide—very interesting Syme turned the little sand car up a gentle rise towards the tortuous 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 crazy things, depending on the inflection you give it. I can speak it some, but not much. Nobody can. We don't think the same." do anything," Syme said curtly. "Don't worry about it." The hills were much closer than they had seemed, because of Mars' toward them. "My God!" he said. "What are those?" 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 as they appeared, being collapsed at the moment. What caused the bulge a valve arrangement from the stomach and feeding directly into the bloodstream. Their faces were vaguely canine, but the foreheads were high, and the lips were not split. They did resemble dogs, in that their thick black 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 car, and it could be seen that most of them were armed with spears, Martians. Syme stopped cursing and watched tensely. Tate said nothing, but he swallowed audibly. One Martian, who looked exactly like all the rest, stepped forward and motioned unmistakably for the two to come out. He waited a moment and into the near-vacuum outside, and he and Tate stepped out. The Martian leader looked at them enigmatically, then turned and started off. The other natives closed in on them, and they all bounded along under the weak gravity. seltin guna getal. " "Yes, there is air here," said the Martian leader, startlingly. "Not enough for your use, however, so do not open your helmets." Syme swore amazedly. "I thought you said they didn't speak Terrestrial," Tate said. Syme ignored him. "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 ignore the obvious. We have not had a spoken language of our own for several thousand years." He darted a glance at Syme's darkly scowling face. His own hairy face was expressionless, but Syme sensed that he was amused. "Yes, you're right," he said. "The language you and your fellows struggled to learn he could see no way out. He began to wonder, if he did, could he keep the Martians from knowing about it? Then he realized that the Martian know." 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 leader, who was standing alertly on all fours a short distance away "There are many secrets in Kal-Jmar," the Martian said, "among them a 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 they remained its slaves. They died of a plague—and other causes. "Will our two races ever live together in amity?" The Martian lowered his head. "That is for unborn generations." He feel the Martian's telepathic call for help surging out. He heard the swift pad of his followers coming across the cavern. He put everything he had into one mighty, murderous effort. Every muscle fiber in his superbly trained body crackled and surged with

<question>:
What was one of the special properties of Kal-Jmar?

<options>:
A A different species of Martian lives there
B It had an atmosphere
C It was a gas planet
D Earthlings that spoke terrestrial lived there

<answer>:

B