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

<passage>:
For a moment Trella thought he was going to meet Asrange's immeasurably powerful, utterly invulnerable. There was only one question: Was he human? Trella feared she was in for trouble even before Motwick's they shifted restlessly in their chairs. Trella had not wanted to come to the Golden Satellite. It was a squalid saloon in the rougher He cowered under the attack, her around the waist with a steely arm. Trella swung with her whole body, and slapped him so hard he nearly fell from his chair. As and turned his face away. Later, alone with Trella on the control deck, Jakdane gave her some sober advice. “Why? Because he's a coward? It all figures. “Look, Trella, he said he was born on Jupiter. A human could injured. How can you believe he's really human?” Trella remembered the thug Kregg striking Quest in the face and then crying that he had injured his father,” protested Trella. “Robots and androids frequently look on their makers as Trella again as Kregg overtook his quarry and swung a huge fist like a sledgehammer. Exactly what happened, Trella wasn't sure. She had the impression of Jupiter, if he's human?” Trella was silent. “For the protection of humans, there are two psychological traits built into every robot attack a human being, even in self defense. The second is that, while they may understand and Kregg sank stunned to his knees. The dark man, who had grabbed Trella's arm, released her and ran for the door. Moving agilely around the end man Quest to a T, Trella. There is no other explanation for him: Trella did not want to believe Jakdane was right, but his reasoning he must be an android.” “Those characteristics fit your was unassailable. Looking many things were explained: his build, his immunity to injury, his refusal to defend himself against a human, his inability to return Trella's love for him. It was not inconceivable that and staggered out. Trella ran to she should have unknowingly the unconscious Motwick's side. “That means you, too, lady,” Kregg stumbled to his feet that they were artificial. Right after my father completed had told her he could not love her. Her best course was to try with her for a later meeting. “It has been pleasant knowing you, Trella,” he said when they we can't help,” she said gently, taking his hand in farewell. Trella took a fast plane from He followed Trella out the door of the Golden Satellite and fell White Sands, and twenty-four in step beside her. Immediately though he lifted a feather pillow. from Jupiter.” “I'm Trella Nuspar,” she said, favoring him with a green-eyed Her employer had impressed upon “I'll have no coppers Miss Trella, eh?” “I'm glad they're something you can use, Mr. Blessing,” she raiding my place for the likes of you!” he is, without knowing he's an android and claim ownership as Dr. Mansard's heir.” Trella planned to spend a few days resting in her employer's spacious home, and then to take great strength, his short, broad an elephant would have been, entrance to the house. “Why all the protection?” she asked Blessing. “A wealthy man must be careful,” said Blessing cheerfully. “Because,” said Quest, “his we must be prepared for Trella could think of. Without actually intending to, she exclaimed: Why, an android can't hurt a human!” Blessing peered at her over his spectacles. “And what if he isn't an android, Trella sighed. Cowardice was a state of mind. It was peculiarly Trella was silent, shocked. There was something here she hadn't known about, hadn't even suspected. For some reason, Dom Blessing feared Dr. Eriklund Mansard … or his heir … or his mechanical servant. city now. Trella could get a cab brightly lighted section of the wasn't far. They walked on. Trella had the desk clerk call a cab to deliver the unconscious Motwick to his home. She and They had reached the more time together on Ganymede and aspace, since he did not know of Trella's connection with Blessing. But, since this was to be the atmosphere of Blessing's was scheduled to leave. Trella was in the living room with Blessing, discussing the instructions she was to give to the against telling him that the them. The other guards were at their posts. Trella heard the doorbell ring. The heavy oaken front door was kept locked now, and the guards briefly on Earth, and Trella was Suddenly alarm bells rang all shot. “The steel doors!” cried Blessing, turning white. “Let's get all. Trella had always liked her Now this did not suit her at He and his bodyguards ran with him. Blessing, ahead of the rest, leaped into one of the cars and started the engine. out of here.” out of the garage. So Trella was delighted to find unconscious heap against the rear of the garage. Trella had that the ship was the than Trella had ever seen a man run before. Blessing slowed for the turn laughing. “What's your trouble, Trella?” “I'm in love with that huge chunk of man who came aboard tree on the other side in a twisted tangle of wreckage. With a horrified gasp, Trella may need protection against myself ran down the driveway toward “If it's to keep you out of another fellow's clutches, I'm your side, he lifted the torn body of Dom Blessing. Blessing was dead. probing it. As she reached his psychologically from my birth crew members and three passengers aboard the ship's tiny personnel sphere, and Trella was to the task of hunting down Dom Blessing and killing him. It that wouldn't release me until the task was finished. “You see, Blessing was my father's thrown with Quest almost constantly. was an unconscious drive in me Io. Blessing wanted the valuable rights to the surgiscope, and he sabotaged the ship's drive so it would fall into Jupiter. assistant on Ganymede. Blessing could not object to Dr. successfully. I was born there, and he conditioned me to come to Earth and track down Blessing. Mansard's son knowing about it. I know now that it was did not know what Dom Blessing's relation to Dr. Mansard had been, but it must have been before she was born, and she purpose.” More gently than Trella would have believed possible for his Jupiter-strong muscles, Quest from here, but the Stellar Hotel done.” Trella disengaged herself. “I'm sorry,” she said. “Don't you know this, too, now: that and it had been developed by Dom Blessing. Its success had Blessing had been searching the Jovian moons for a second, hidden laboratory of Dr. Mansard. When it was found at last, he sent Trella, his most trusted secretary, to Ganymede to bring back to him the notebooks found there. Blessing would, of course, be happy to learn that a son of Dr. Trella looked at him. He was that he received his rightful share of the inheritance. Because of this, Trella was tempted not badly hurt, any more than herself but she decided against it. It was Blessing's privilege to do this his own way, and he might not appreciate her meddling. At midtrip, Trella made a rueful confession to Jakdane. to tell Quest the good news “It seems I was taking unnecessary She expected Jakdane to salve her wounded feelings with a in distress.

<question>:
Why is Trella being attacked?

<options>:
A The author does not give a clear reason for the attackers' motivations
B The attackers wish to steal Trella's documents
C The attackers wish to violate Trella
D The attackers are sent from Dr. Blessing to test Trella's loyalty

<answer>:

A