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

<passage>:
them, how could he give Corisande up to them? True, it was the right thing to do—but, for the first time in his life, he could not bring himself to do what he knew to be right. He was weak, weak—and weakness was sinful. His old Belphin teacher had taught him that, too. As Ludovick writhed restlessly upon his bed, he became aware that someone had come into his chamber. "Ludovick," a soft, beloved voice whispered, "I have come to ask your help...." It was so dark, he could not see her he knew where she was only by the glitter of the jewel on her neck-chain as it arced through the blackness. "Corisande...." he breathed. "Ludovick...." she sighed. Now that the amenities were over, she resumed, "Against my will, I have been involved in the family plot. My uncle has invented a secret weapon which he believes will counteract the power of the barriers." you in the courtyard. Well, what happened was I wanted to gain time, so I said I had a secret weapon of my own invention which I had not perfected, but which would cost considerably less than my uncle's model. We have to watch the budget, you know, because we can hardly expect the Belphins to supply the components for this job. Anyhow, I thought that, while my folks were waiting for me to finish it, you would have a chance to warn the Belphins." "Corisande," he murmured, "you are as noble and clever as you are beautiful." Then he caught the full import of her remarks. " Me! Ludovick stretched his own well-kept golden body and rejoiced in the knowing that he was a man and not a Belphin. Immediately afterward, he was sorry for the heartless thought. Didn't the Belphins work only to serve humanity? How ungrateful, then, it was to gloat over them! Besides, he comforted himself, probably, if the truth were known, the Belphins liked "But how can you tell what is right and what is wrong?" Ludovick persisted. "We know The Belphin. You're coming to warn him! That makes a big difference. Ludovick...." She took his hands in hers should still, he had enjoyed life so much. "Corisande, wouldn't it be much simpler if we just destroyed your uncle's secret weapon?" Ludovick packed his portable scriptwriter in its case and went to call on the girl next door, whom he loved with a deep and intermittently requited passion. As he passed between the tall columns leading into the Flockhart courtyard, he noted with regret that there were quite a number of Corisande's relatives present, lying about sunning themselves and sipping beverages which probably touched the legal limit of intoxicatability. Much as he hated to think harshly of anyone, he did not like Corisande Flockhart's relatives. He had never known anybody who had as many relatives as she did, and sometimes he suspected they were not all related to her. Then he would dismiss the thought as unworthy of him or any right-thinking human being. He loved Corisande for herself alone and not for her family. Whether they were actually her family or not was none of his business. the Belphins surrender their secrets to gratify the idle curiosity of a poet? It was not that griping was illegal, for the Belphins permitted free speech and reasonable conspiracy it was that such behavior was considered ungenteel. Ludovick would never have dreamed of associating with this set of neighbors, once he had discovered their tendencies, had he not lost his heart to the purple-eyed Corisande at their first meeting. "They've taken away our frontiers!" Behind his back, Corisande made a little filial face at Ludovick. Ludovick tried to make the old man see reason. "But I'm happy. And everybody is happy, except—except a few killjoys like you." Corisande gave one of the rippling laughs he was to grow to hate so much. "Darling, you "Nonsense, my boy they'll adore you. You'll be a hero!" Events proved him right. Even those people who had lived in apparent content under the Belphins, accepting what they were given and seemingly enjoying their carefree lives, now declared themselves to have been suffering in silent resentment all along. They hurled flowers and adulatory speeches at Ludovick and composed extremely flattering songs about him. Shortly after he was universally acclaimed President, he married Corisande. He couldn't escape. "Why doesn't she become President herself?" he wailed, when the relatives came and found him hiding in the ruins of the Blue Tower. The people had torn the Tower down as soon as they were sure The Belphin was dead and the others thereby rendered inoperant. "It would spare her a lot of bother." "Because she is not The Belphin-slayer," the uncle said, dragging him out. "Besides, she loves you. Come on, Ludovick, be a man." So they hauled him off to the wedding and, amid much feasting, he was married to Corisande. He never drew another happy breath. In the first place, now that The Belphin was dead, all the machinery that had been operated by him stopped and no one knew how to fix it. The sidewalks stopped moving, the air conditioners stopped conditioning, the food synthesizers stopped synthesizing, and so on. And, of course, everybody blamed it all on Ludovick—even that year's run of bad weather. There were famines, riots, plagues, and, after the waves of mob hostility had coalesced into national groupings, wars. It was like the old days again, precisely as described in the textbooks. In the second place, Ludovick could never forget that, when Corisande had sent him to the Blue Tower, she could not have been sure that her secret weapon would work. Love might not He turned to the girl, who was looking thoughtful as she stroked the glittering jewel that always hung at her neck. "Corisande, how can you stay with these—" he found another word—"these it makes him feel she doesn't really love him. So, in thirtieth year of his reign as Dictator of Earth, Ludovick poisoned Corisande—that is, had her poisoned, for by now he had a Minister of Assassination to handle such little matters—and married a very pretty, very young, very affectionate blonde. He wasn't particularly happy with her, either, but at least it was a change. —EVELYN E. SMITH have conquered all—in fact, it was the more likely hypothesis that it wouldn't—and he would have been killed by the first barrier. And no husband likes to think that his wife thinks he's expendable ." subversives Later that night, he slipped over to the Flockhart villa and nosed about in the courtyard until he found the window behind which the family was conspiring. He peered through a chink in the curtains, so he could both see and hear. Corisande was saying, "And so I think there is a lot in what Ludovick said...." Bless her, he thought emotionally. Even in the midst of her plotting, she had time to spare a kind word for him. And then it hit him: she, too, was a plotter "You suggest that we try to turn the power of love against the Belphins?" the uncle asked ironically. Corisande gave a rippling laugh as she twirled her glittering pendant. "In a manner of speaking," she said. "I have an idea for a secret weapon which might do the trick——" At that moment, Ludovick stumbled over a jug which some careless relative had apparently left lying about the courtyard. It crashed to the tesserae, spattering Ludovick's legs and sandals with a liquid which later proved to be extremely red wine. convince

<question>:
What is Corisande’s secret weapon?

<options>:
A She uses Ludovick's obedient nature and moral character to trick him into going into the Blue Tower.
B She uses Ludovick's poetry to convince others to join her cause.
C A virus to make the Belphin robots malfunction.
D The love between Corisande and Ludovick.

<answer>:

A