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

<passage>:
Ro moved cautiously. He knew the jungles of Mars well, knew the Ro was returning from the north. He had seen the great villages of fair face had disturbed his slumber so often, appearing in his dreams For a long moment Ro studied the approaching creatures. Then he gasped Ro exclaimed his surprise, then his rage. His handsome face was grim as furry face and twitching tail. The Oan, however, was too intent on his prey to notice Ro at first, and when he did, it was too late. With hardly a glance at his fallen foe, Ro ran on to meet the girl. She eyes were wet with gladness. Warm tears ran down Ro's arm. Finally Na lifted her beautiful head. She looked timidly at Ro, her face a mask of respect. The young Martian tried to be stern in meeting with women but he smiled instead. "You were alone in the woods!" Ro exclaimed. "Since when do the women men signaled that they could not understand. The white men smiled, and Ro groaned aloud as Na finished her tale. His homecoming was a meeting Ro squared his shoulders and set his jaw. He wiped a hint of tears from "Then there will be more to kill," answered Ro without turning. Na smiled. Ro was angry, but anger did not make him blind. He would make a good mate. Ro was silent then. In a short time it would be dark enough to go down understood why she had crept into his dreams. The darkness settled quickly. Soon Ro could barely make out the girl's "All men will know now that you are the mate of Ro," he whispered. And The climb was long and dangerous. Ro's skin glistened with sweat. prickled. He prayed he wouldn't be seen. An alarm now would spoil his guard. He was coming straight at Ro. The young Martian shrank back. mother's voice. She had spoken those words when he was a child, to keep him from straying too far. the night. Ro could see his large ears, hear his twitching tail. In a moment the beast would stumble over him. Like a phantom, Ro arose from his crouch. The rat man was startled, frozen with fear. Ro drove his right arm around. The stone in his hand Breathing more easily, Ro moved on. He reached the edge of the small heaps. They would be the slumbering rat men. Ro suppressed an urge to spring amongst them and slay them as they slept. feigned sleep. In the dusk he appeared no different than the others. was as though he was feeling 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 Once again his mind grew light. The girl's thoughts assured him she would follow his instructions. Time passed quickly. To Ro, it seemed that his fingers were all thumbs. Ro was more confident as he moved to untie the others. He worked more 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. them and Oan camp grew. Ro increased his pace when silence was no "She is the one I have chosen for my mate," Ro answered. Ro's body tensed and quivered. A low growl issued from deep in his Ro struck his foe head on. They went down in a frenzied bundle of fury. The rat man's tail lashed out to twist around Ro's neck. With frantic strength, Ro tore it away before it could tighten. fists into his soft stomach. Suddenly shifting his attack, Ro wrapped air that would give it life. But Ro's hands were bands of steel, Ro dismounted the limp body. His face wore a wildly triumphant smiled as she recognized Ro. The young Martian breathed a sigh of Ro gathered the girl in his arms. He spoke softly to her to help her When she had recovered from her shock, the small group traveled on. Ro "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. and less impressive. Ro then centered his attention on the girl. Her the lean man nodded—"Grimm—" the stouter man acknowledged the Ro introduced himself and Na. Ro sighed. Ro slipped his arm about Na's shoulder and drew her closer. With their Ro awakened with the dawn. He was startled to find that Na had left his "You will make no mate at all," Ro said sternly, "and there will be no He glared at her for a moment, then smiled and helped her with her burden. The others in the cave awakened. Ro noticed that Charlotte had slept beside Carlson, but moved away shyly now that it was daylight. He noticed, too, that Grimm was seeing the same thing and seemed annoyed. Ro smiled. These young white men were no different than Martians where a girl was concerned. It was Carlson who asked, "How do you expect the six of us to attack the rat men?" these sticks that shoot fire." Grimm laughed. in this wilderness we have sticks and stones to work with." Ro sprang to his feet to tower above the man. His handsome face was twisted in anger. "You're lying," he shouted aloud, forgetting that the white man couldn't understand his words. "You're lying because you are afraid. Grimm climbed to his feet and backed away. Ro advanced on him, his The old man also rose. He placed a restraining hand on Ro's arm. "He's lying," said Ro with his thoughts. "Tell him I'm speaking the truth, professor," said Grimm aloud. The professor repeated Grimm's words with his thoughts. "It would be Ro turned quickly. Ro fell silent. He walked to the mouth of the cave and stared out. When 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 "Why me?" Grimm demanded. "Why not Carlson? Or are you saving him for Grimm stumbled backward. He fell at the cave's entrance. His hand, Gritting his teeth, Carlson charged at Grimm. But Ro moved more Grimm brushed himself off as he got to his feet Carlson turned to Ro. "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 Then she will reveal herself." Ro looked at Na for a long moment before they parted. He grew very proud of what he saw. There was no fear in her eyes. Her small chin was firm. He turned to Carlson. The young Earthman was looking at Charlotte in much the same way. Carlson seemed to come out of a trance. He swung around to trail Ro up Once Ro stopped to look down into the valley. But Na and the others 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?" Carlson straightened. He weighed Ro's words before answering. Finally he said, "I didn't want to make trouble. It was a bad time, and senseless, besides. Charlotte and I are planning to be married when we return to America. It's not as though Grimm was still in the running. I'm sure he'll see reason when we tell him. It's foolish to be enemies." Carlson seemed surprised. "It wouldn't be legal. Who would perform the ceremony?" Ro seemed puzzled, then he laughed. Ro didn't speak. He didn't concentrate and transmit his thoughts,

<question>:
Why did Ro find it funny when Grimm was irritated?

<options>:
A He was amused that relationship dynamics are universal
B He liked to see the white men fight
C He liked Carlson better
D He thought it was funny that Charlotte was shy

<answer>:

A