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

<passage>:
of the Desert Men. With him is his guardian, Dr. Malcomb Rice, the Then the moderator questioned Malcomb, while Gavir nervously of Earthmen. Malcomb told how he had been struck by Gavir's intelligence and missionary-taught ability to speak Earth's language, where the magic powers of the Earthmen and the helplessness of the Martian tribes would always protect the head of MDC from Gavir's that Malcomb and the moderator winced. But Malcomb had told him that of the camp as the shriveled Martian sun struck the tops of the Shakam perfect. If it failed, the knife would be lost and the drock would He began shouting even before Gavir removed his headset. "What kind Malcomb said, "You can't expect an untrained young Martian to control his very thoughts. And may I point out that your tone is hostile?" At this a sudden change came over the producer. The standard Earth expression—invincible benignity—took control of his face. "I apologize for having spoken sharply, but dreamcasting is a nerve-wracking business. If it weren't for Ethical Conditioning, I don't know how I'd control my aggressive impulses. The Suppression of Aggression is the Foundation of Civilization, eh?" Malcomb smiled. "Ethical Conditioning Keeps Society from Fissioning." He shook hands with the producer. "Come around tomorrow at 1300 and collect your fee," said the Earthmen. Despite Malcomb's orders, he was going to find a seller of "In books there is power. All that you call magic in our Earth Earthmen—godlike beings in their perfect health and their impregnable benignity—through the streets of the city. Platforms of force raised shadows of hunched buildings. A half-dozen Earthmen approached him, The Earthmen wore black garments and furs and metal ornaments. The Earthmen turned to one another. "Take pain, Martian!" The Earthman with the black hat raised his arm, and the long heavy knock Earthmen down. The mood of the The Earthmen disappeared into a lift-force field. Gavir decided not to "But you did not tell me that Earthmen might try to kill me. You have told me that Earthmen are good and peace-loving, that there have been no acts of violence on Earth for many decades. You have told me that only the MDC men are exceptions, because they are living off Earth, and this somehow makes them different." "Well, those people you ran into are another exception." "Why?" "You know about the Regeneration and Rejuvenation treatment we have here on Earth. A variation of it was given you to acclimate you to Earth's gravity and atmosphere. Well, since the R&amp R treatment was developed, we Earthmen have a life-expectancy of about one hundred fifty years. Those people who attacked you were Century-Plus. They are over a hundred years old, but as healthy, physically, as ever." "What is wrong with them?" "They seem to have outgrown their Ethical Conditioning. They live wildly. Violently. It's a problem without precedent, and we don't know what to do with them. The fact is, Senile Delinquency is our number "They're too powerful. They are often people who've pursued successful space-port. He was youthful in appearance, as were all Earthmen, but a than average. He pointed a rigid finger at Malcomb and Gavir. "I want you two to hear a condensed recording of statements taken from calls we received "Enormous!" like being mad!" "Keep him on Earth." the voices fell silent. "Those callers that admitted their age were all Century-Plus. The boy A Senile Delinquent! thought Gavir. She looked like Davery's younger sister. Malcomb stared at her apprehensively, and Gavir wondered if something they go for. Undoubtedly because you're—forgive me—such a complete barbarian. That's what they're all trying to be." "Spare me another lecture on Senile Delinquency, Our Number One ." "It's part of a fertility rite," Malcomb explained. "Great! Give the Senile Delinquents another workout. It's not quite ethical, but its good for us. But for heaven's sake, Blue Boy, keep your mind off MDC!" The following week, Gavir sang the next morning. "Best response I've ever seen! The Century-Plussers have been rioting and throwing mass orgies ever since you sang. But they take time out to call us up and beg for more. I've got a sponsor and a two-year Then he stopped himself. He turned the gesture into the proffer of a handshake. "How do you do?" he said quietly. In his mind he congratulated himself. He had learned emotional control from the Earthmen. Here was the man who had ordered his father crucified! Yet was not a trace of the usual Earthman's kindliness in his square, Preserve." "Mr. Spurling!" said Malcomb. "Your tone is hostile!" "Damn right. That Ethical Conditioning slop doesn't work on me. I've lived too long on the frontier. And I know Bluies." snapped, "Disgusting! An Earth woman and a Bluie! If you were on Mars, Spurling laughed. "I've heard about you Century-Plussers. You're all "You screwball Senile Delinquent," Spurling yelled after Sylvie, "you "It won't happen again. You're a hero to the Senile Delinquents now. most prominent Senile Delinquents of our day. He's president of the didn't fit into the bland, non-violent world of Malcomb and Hoppy. He shook his head. He said, "Sylvie, why—well, why are you the way you are? Why—and how—have you broken away from Ethical Conditioning?" Sylvie frowned. She spoke a few words into the air, ordering drinks. She said, "I didn't do it deliberately. When I reached the age of know what I wanted to do. It was Ethical Conditioning or nothing, so I picked nothing. And here I am, chasing nothing." costumes and manners of some more colorful time. You try ridiculous things, disgusting things, vicious things. You know they're all nothing, but you have to do something, so you go on doing nothing, you. Since then you have captured my imagination. I now hold you to be the noblest savage of them all. Henceforward please consider me, Your obedient servant, Hat Rat." not like a Martian woman, but he found the differences exciting and hundred years old. hundred million—ninety-five percent of whom were Century-Plussers. Complaint It was an ancient song, a Desert Man's outcry against injustice, enemies, false friends and callous leaders. It was a protest against A recorded voice boomed: "This is Hat Rat. Pay the Blue Boy what he deserves, or I will give you death. It will be a personal thing between you and me. I will besprinkle you with corrosive acids dozens I cannot always control the pictures I make. These images come into my mind even though they have nothing to do with me." Hoppy shook his head. "That's because you haven't had Ethical Conditioning. We don't have this trouble with our other performers. You just must remember that dreamvision is the most potent communications medium ever devised. Be the Senile Delinquents were giving a party for him in the Pandemonium Jarvis Spurling's square face was dark with anger. "You deliberately put my face on that animal! You want to make the public hate me. I pay your salary and keep you here on Earth, and this is what I get for it. "The enemy!" the Hat Rat shouted. floor and lay there face up, eyes open. The Senile Delinquents of

<question>:
Why are the Earthlings always "invincibly benign?"

<options>:
A All of the malevolent people are sent to Mars
B There is no more inequality in Earth's society
C People live to be much older and are more calm because of this
D They undergo ethical conditioning

<answer>:

D