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

<passage>:
." The song was a rollicking, ribald ditty, a favorite of the planters and miners, the space pilots She bent her head in acknowledgment so that her bronze red hair fell down about her face. There was perspiration on her upper lip and the singer but kept his pale, immature face bent over the keys, while his fingers lightly, automatically picked out the tune. Sweat trickled down the back of his neck, plastered his white coat to his back. The girl, with an almost imperceptible gesture, shook her head. The night was very hot but then it is always hot on Mercury, the newest, the wildest, the hottest of Earth's frontiers. Fans spaced about the garden's walls sluggishly stirred the night air, while the men and women sitting at the tables drank heavily of Latonka, the pale green wine of Mercury. Only the native waiters, the enigmatic, yellow-eyed Mercurians, seemed unaffected by the heat. They didn't sweat at all. Up on the stage the singer was about to begin another number when she stiffened. pulled out a chair, motioned for the waiter. The Mercurian, his yellow engineering the revolution. The real Mercurian patriots are against it does, the Terrestrials here will be massacred. The Mercurians hate them. We haven't but a handful of troops." Jaro Moynahan wiped the sweat from his forehead with a fine duraweb handkerchief. "I had forgotten how abominably hot it can be here." the very soul of the revolution. The Mercurians worship him. They will "There isn't much time," he said after a moment. "The Rains are due any day now." glowing in light, the next the hot black night swooped down on the revelers, pressing against their eyes like dark wool. The fans about the walls slowed audibly and stopped. It grew hotter, closer. his sleeve. Somewhere a girl giggled. "What's coming off here?" growled a petulant male voice. Other voices took up the plaint. On the heels of his speech the lights flashed on, driving the night upward. The fans recommenced their monotonous whirring. It made him think of cool green grapes beaded with dew. On the hot, teeming planet of Mercury it was as refreshing as a cold plunge. reputation of being able to take care of herself. He beckoned a waiter, paid his bill. As the Mercurian started to leave, a thought struck Jaro. These yellow-eyed Mercurians could see as well in the dark as any alley-prowling cat. For centuries they had lived most their lives beneath ground to escape the terrible rays of the sun. Only at night did they emerge to work their fields and ply their trades. He peeled off a bill, put it in the waiter's hands. possibility. If the girl had been abducted, only Mercurians could have engineered it in the dark and the Mercurians were a clannish lot. heat of the sun. Beneath his feet, he knew, stretched a labyrinth of rooms and passages. Somewhere in those rat-runs was Karfial Hodes, the revolutionist, and the girl. following him. They were never visible, but to his trained ears there came stealthy, revealing noises: the brush of cloth against the baked earth walls, the sly shuffle of a step. He ducked down a bisecting the dense, humid night, he was like a blind man trying to elude the cat-eyed Mercurians. of a fire. The Mercurian dawn was about to break. With an oath, he set out again for his hostelry. He made no further effort to elude the followers. Once back in his room, Jaro Moynahan stripped off his clothes, unbuckled a shoulder holster containing a compressed air slug gun, stepped under the shower. His body was lean and brown as his face and marked with innumerable scars. There were small round puckered scars and long thin ones, and his left shoulder bore the unmistakable brownish patch of a ray burn. Stepping out of the shower, he dried, rebuckled on the shoulder holster, slipped into pajamas. The pajamas were blue with wide gaudy stripes. Next he lit a cigarette and stretching out on the bed began to contemplate his toes with singular interest. was little doubt but that he had killed quite a number of men. But this business of hunting a man through the rat-runs beneath the city was out of his line. Furthermore, there was something phony about the entire set up. The Mercurians, he knew, had been agitating for freedom for years. Throwing off the latch, he stepped back, balancing on the balls of his feet. "Come in," he called. Mr. Peet licked his lips. "But you will, surely you will. Unless Karfial Hodes is stopped immediately there will be a bloody uprising all over the planet during the Festival of the Rains. Earth doesn't realize the seriousness of the situation." "Then I was right here, Mercurians as well as Earthmen, who recognize the danger. We I don't wonder that you are afraid of a revolution." Mr. Peet took out a handkerchief and mopped his forehead. "Fifteen white suit was blotched with sweat and dirt. "They told me Mr. Peet was here," he said. "It's for you," said Jaro over his shoulder. "I got away. Look, Mr. Peet, I got to see you alone." Albert Peet said, "Would you excuse me, Mr. Moynahan?" He licked his the door shut after him. Jaro lit a cigarette. He padded nervously back and forth across the room, his bare feet making no noise. He sat down on the edge of the an oath he threw open the door. The hall was empty. II Jaro returned to his room, stripped off his pajamas, climbed back into as streets during the flaming days. Here in the basements and sub-basements were located the shops and dram houses where the Mercurians sat around little tables drinking silently of the pale green Latonka. The burrows were but poorly lit, the natives preferring the cool gloom, and Jaro had to feel his way, rubbing shoulders with the aren't telepathic, honey." "Oh," said Miss Webb, "the offices of the Latonka Trust." The girl in the visoscreen thawed like ice cream in the sun. "I'm sure Dr. Baer can come. He'll be there in a moment." "Thank you," said Miss Webb. She flicked the machine off, then added: that—ah—a little extreme? I'm afraid it might incapacitate him, and I had a job for him." Jaro began again patiently. "Wait for me in the first grog shop. There's something I must know. It's important." He cleared his throat. "Don't you find the heat rather uncomfortable, Miss Webb. But perhaps you've become accustomed to it." be on the next liner back to Earth." Without answering, Jaro backed watchfully from the room. Once Jaro Moynahan had regained the street, he mopped his forehead with his handkerchief. Whatever was going on, these boys played for keeps. Warily he started down the passage toward the native quarter. At the first basement grog shop he turned in. His eyes swept the chamber, then "Since we're going to be so chummy," she replied "you might begin by " Awk! " said Joan, choking on the Latonka. revolution." "What revolution? I'm going around in circles." "The Mercurians, of course." "I don't believe it," said the girl. "The Mercurians are the most induce a Mercurian to kill, even in self-protection. That's why Albert going to grant the Mercurians their freedom. Everybody knows that the first thing the Mercurians will do, will be to boot out the Latonka inciting the Mercurians to rebellion. The newscaster had a line about

<question>:
How did the Mercurians adjust to the heat?

<options>:
A Their yellow eyes filtered the sun’s rays.
B They mostly lived under the ground.
C Their skin kept them cool.
D They would sweat to cool off.

<answer>:

B