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

<passage>:
came from black space, carrying weird weapons—to fight for a race of which they had never heard. in caves, and wore coverings on their feet and shining rings in their ears. And having quenched his curiosity about these people and their came to be playing tag with the Oan." Na lowered her eyes. "I was caught in the forest below the cliffs. The Oan spied me and I ran. The chase was long and tiring. I was almost ready to drop when you appeared." "You were alone in the woods!" Ro exclaimed. "Since when do the women of our tribe travel from the cliffs alone?" landing in the valley below. Many colored fire spat from one end of it. "The men of our tribe snatched up stones, and holding one in their hands and one beneath their armpits, they climbed down to battle or "They were strange men indeed white as the foam on water, and clothed in strange garb from the neck down, even to coverings on their feet. They made signs of peace—with one hand only, for they carried same one-handed sign of peace, for they would not risk dropping their men signaled that they could not understand. The white men smiled, and words. The white men spoke with their thoughts. weapons by pointing them at a tree and causing flame to leap forth to burn the wood in two. We were indeed glad they came in peace. "That night we asked them to sleep with us in the caves, but they made camp in the valley instead. The darkness passed swiftly and silently, and with the dawn we left our caves to rejoin our new friends. But everywhere a red man showed himself, he cried out and died by the flame from the white men's weapons. "I looked into the valley and saw hundreds of Oan. They had captured our friends in the night and were using their weapons to attack us. There was a one-sided battle that lasted three days. Finally, under cover of night, we were forced to leave the caves. One by one we went, and those of us who lived still travel alone." Ro groaned aloud as Na finished her tale. His homecoming was a meeting with tragedy, instead of a joyful occasion. Surely he didn't fall to the Oan?" "He had no chance to fight," Na answered. "Two of your brothers died with him on that first morning." Ro squared his shoulders and set his jaw. He wiped a hint of tears from his eyes. "They shall pay," he murmured, and started off toward the cliffs again. Na trailed behind him. Her face was grave with concern. "They are very many," she said. "And the white ones, as well. They probably keep them alive to repair the weapons if they become useless. But when I have slain a few Oan, I will set the white ones free. They will help me to make more weapons. Together we will fight the rat men." to place. There were no fires, for the Oan were more beast than man and feared flame but Ro could make out four prone figures. They appeared to "They traveled through space in their 'ship,'" Na answered. "They called themselves an expedition." Ro was silent then. In a short time it would be dark enough to go down into the valley. When he had rescued the white ones, he would learn more about them. "All men will know now that you are the mate of Ro," he whispered. And he kissed her, as was the custom of his tribe when a man took a wife. Without another word he disappeared over the edge of the cliff. They He had lived in the cliffs all his life, and had made many perilous heaps. They would be the slumbering rat men. Ro suppressed an urge to spring amongst them and slay them as they slept. He lay flat on his stomach and inched his way ahead. It was slow work, but safer. When a sound reached his ears he drew himself together and feigned sleep. In the dusk he appeared no different than the others. We spoke with our thoughts. ' "Be still. I've come to free you." And then, because it seemed so futile, he whispered the words aloud. Then his mind seemed to grow light, as though someone was sharing the His groping hands found the girl's arm and moved down to the strips of hide that bound her wrists. He fumbled impatiently with the heavy knots. "Don't move when you are free," he warned the girl as he worked. "I must release the others first. When all is ready I will give a signal with my thoughts and you will follow me." His breathing was heavy as he struggled with the knots. But finally the golden-haired girl was free. Ro was more confident as he moved to untie the others. He worked more easily as each came free and he started on the next. When they were ready, Ro signaled the four white people to follow him. They rose quietly and trailed him into the woods. The girl whispered something to one of the men. Ro turned and glared at her through the shadows. longer necessary. The four white people stumbled ahead more quickly. "Who is Na?" asked the girl. "She is the one I have chosen for my mate," Ro answered. The white girl was silent. They traveled quite a distance without Finally the man with the silver hair asked, "Why did you risk your life to rescue us?" "With your help I will avenge the death of my father and brothers and the men of my tribe." and tightened. Over and over they rolled. The Oan clawed urgently at the Martian's choking fingers. His chest made strange noises as it pleaded for the Ro gathered the girl in his arms. He spoke softly to her to help her forget. When she had recovered from her shock, the small group traveled on. Ro "We will stay here," he told the others, "until we are ready to attack the Oan." "But there are only six of us," one of the white men protested. "There are hundreds of the beasts. We wouldn't have a chance." Ro smiled. pure white. They were handsome, Ro thought, in a barbaric sort of way. well provided for." "You will make no mate at all," Ro said sternly, "and there will be no table if you wander off. Your next meeting with the Oan may not be so When they had finished breakfast, they sat around the floor of the cave the rat men?" "The Oan are cowards," Ro answered. "They are brave only because they "You're lying," he shouted aloud, forgetting that the white man camp. All of the rat men cannot be guarding it. Perhaps, by revealing yourself, you can lure the guards away from their post." He repeated his plan to the others. "But they'll kill her," gasped Charlotte. "She will be a woman alone," said Ro. "The Oan prefer to capture women when they can." "Then she'll be captured," the professor said. "It's much too risky." Ro laughed. "Do you think I will let her go alone? I will be close by. Na can lead "It might work at that. Grimm can go with you. Carlson and Charlotte will go with me." "Why me?" Grimm demanded. "Why not Carlson? Or are you saving him for swiftly. He caught the white man and forced him back. "This is no time for fighting," he said. "When the Oan are defeated you can kill each other. But not until then." "I'll go with you," he said. "Grimm can go with Charlotte and the professor." When they had detailed their plan, the party left the cave. Ro led them were gone. He felt a pang of regret as he turned to move upward. When they had reached the top, he and Carlson set to work piling rocks and boulders at the edge of the cliff. They chose the point directly over the narrowest part of the valley. If all went well, the Oan would be trapped. They would die under a hailstorm of rock. "You would have liked a more tender goodbye with Charlotte," Ro said to Carlson as they worked. "Was it fear of Grimm that prevented it?" he said, "I didn't want to make trouble. It was a bad time, and "Last night I thought that we on Mars are backward. Now I'm not so sure. When we find our mates here, we take her. There is no one to

<question>:
What was the consequence of the white men choosing to sleep in the valley?

<options>:
A They battled the Oan for three days
B They went to war with the red men
C They had a great feast
D They were taken captive

<answer>:

D