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

<passage>:
Thig of Ortha was the vanguard of the conquering "HORDE." He had blasted across trackless space started toward the little stretch of trees and brush, walking carefully because of the lesser gravitation. Thig was shorter than the average Earthman—although on Ortha he was well above the average in height—but his body was thick and powerfully muscled. His skull was well-shaped and large his features were regular, perhaps a trifle oversize, and his hair and eyes were a curiously matching blend of reddish brown. Oddest of all, he wore no garments, other than the necessary belt and straps to support his and wood in its paw. It walked upright as did the men of Ortha. Thig's cold eyes opened a trifle wider as he stared into the thing's stupid face. It was as though he was looking into a bit of polished metal at the reflection of himself! could not write a word. Visions of whooping red-skinned Apaches and be-chapped outlaws raiding his little trailer home kept rolling up out of his subconscious. Yet he and his wind. He fought futilely against trained muscles. The hand clamping his throat relaxed for a moment and hacked along the side of his head. Blackness flooded the brain of Lewis, and he knew no more. "There it is," announced Thig, dropping the limp body of the captured must have built the cities we saw as we landed." "He resembles Thig," announced Kam. "But for the strange covering he wears he might be Thig." "Thig will be this creature!" announced Torp. "With a psychic relay we "Do not question the word of your commander," growled Torp, swelling For ten hours or more the droning hum of the relay sucked Terry's brain dry of knowledge. The shock upon the nervous system of the Earthman proved too violent and his heart faltered after a time and stopped completely. Twice, with subtle drugs they restored pseudo-life to his body and kept the electrical impulses throbbing from his tortured brain, but after the third suspension of life Thig removed his helmet. "There is nothing more to learn," he informed his impassive comrades. An hour later, his scars and altered cartilage already healed and painless, Thig again scraped sand over the entrance to the space ship primitive impulses of barbarism so he was incapable of understanding the emotions that swept through his acquired memory. and three other editors asked for shorts soon." "Shoulda got a hundred bucks for that yarn," grunted Thig, and gasped. For the moment he had been Lewis Terry and not Thig! So thoroughly had he acquired the knowledge of Terry that he found himself unconsciously adopting the thinking and mannerism of the other. All the better this on as they climbed the steps, "but nowhere was there any place as beautiful as our own little strip of sky and water." Thig sank into a dusty old swing that hung on creaking chains from the exposed rafters of the porch roof. He looked down at the dusty gray car and the bulbous silvery bulk of the trailer that had been their living quarters for almost three months. Strange thoughts were afloat in the chaos of his cool Orthan brain. imperfect though their civilization might be, to make room for the Hordes? Thig tried to tell himself that it was the transmitted thoughts of the dead Earthman that made him feel so, but he was not too sure. For three months he had lived with people who loved, hated, wept and sacrificed who nestled trustingly against his tense man's body and slept—the son of Ellen and the man he had destroyed. Thig groaned. He was a weakling to let sentimentality so get the better of his judgment. He would go now to the space ship and urge them to blast off for Ortha. He sprang off the porch and strode away down the lived no longer. He mentally titled it: "Rustlers' Riot" and blocked in the outlines of his plot. One section of his brain was that of the "You have done well," announced Torp when Thig had completed his report forgotten." "Check the blood of Thig for disease, Kam," ordered Torp shortly. "His words are highly irrational. Some form of fever perhaps native to this world. While you examine him I will blast off for Ortha." Thig followed Kam into the tiny laboratory and found a seat beside the squat scientist's desk. His eyes roamed over the familiar instruments and gauges, each in its own precise position in the cases along the it tore free from the feeble clutch of the sand about it, and they were rocketing skyward. Thig's Kam eyed him coldly and lifted a shining hypodermic syringe from its case. He approached Thig warily, aware that disease often made a maniac of the finest members of the Horde. must eliminate for the good of the Horde." Then it was that Thig went berserk. His fists slashed into the thick jaw of the scientist and his fingers ripped at the hard cords overlying the Orthan's vital throat tubes. His fingers and thumb gouged deep into and dragged his blaster from it. Thig's other hand clamped over his and for long moments they swayed there, locked together in silent deadly The scales swung in favor of Kam. Slowly the flaring snout of his weapon tilted upward until it reached the level of Thig's waist. Thig suddenly released his grip and dragged his enemy toward him. A sudden reversal of pressure on Kam's gun hand sent the weapon swivelling about full upon its owner's thick torso. Thig's fingers pressed down upon Kam's button finger, down upon the stud set into the grip of the decomposition blaster, and Kam's muscles turned to water. He shrieked. Before Thig's eyes half of his comrade's body sloughed away into foul corruption that swiftly gave way to hardened blobs of dessicated matter. Horror for what he had done—that he had slain one of his own his skull and in his matted hair. Torp must have thought he had killed him with those savage blows upon the head. Even Torp, thought Thig ruefully, gave way to the primitive rage of his used the blaster to destroy any possibility of remaining life in his unconscious body. Thig rolled slowly over so that his eye found the door into the control room. Torp would be coming back again to dispose of their bodies through the refuse lock. Already the body of Kam was gone. He wondered why he had been left until last. Perhaps Torp wished to take cultures of his blood and tissues to determine whether a disease was responsible scuffle out of silence and a choked cry in the man's throat squalled out into a senseless whinny. Thig raised himself up on a quivering elbow and slid the black length of the blaster in front of him. His eyes sought the doorway and stared full into the glaring vacant orbs of his commander. Torp leaned there watching him, his breath gurgling brokenly through his deep-bitten lips. The clawing marks of nails, fingernails, furrowed his face and chest. He was a madman! The deadly attack of Thig He went to the desk where Torp had been writing in the ship's log and emotions he had experienced on Earth since that day, so many months before, when he had felt the warmness of Ellen's lips tight against his. Thig flipped the drive lever, felt the thrumming of the rockets driving him from the parent ship. crowded his mind. He shivered suddenly, remembering his utter callousness the first time he had sent a space ship whipping down toward the hills and valleys were hot, bitter pains. Earth was not far below him. As he let gravity suck him earthward, he heaved a gasp of relief. He was no longer Thig, a creature of a Horde's

<question>:
Why did Torp feel it was necessary to test Thig's blood for disease after he returned?

<options>:
A Thig did not want to return to Ortha.
B Thig seemed to be sick after he returned.
C Thig had become sentimental over the people of Earth.
D Thig's eyes were roaming and he seemed disoriented.

<answer>:

C