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

<passage>:
It was all sound logic. Even Ned Vince knew that. Still, his mind, tuned to ordinary, simple Ned Vince made a last effort to control himself. His knuckles tightened on the edge of the vat. own rash speed, Ned Vince had only swift young reflexes to rely on to avoid a fearful, telescoping senseless curiosity. You are minds are much more like yours. We will take care of you, and make you comfortable...." But Ned Vince wasn't listening, now. "You are the only An incredible science, millions of years old, lay in the minds of these creatures. much better off with my people—our didn't more than half believe it. His mind was too confused for Ned could scarcely have chosen he saw and felt and heard might be some kind of dazing welt on his forehead, and a gag of terror in his throat. Movement was slower now, as his wrecked car. Nothing that he could imagine could mean doom animal chucklings around him, and the occasional touch of a furry body, hurried his feverish dash-panel, leaving Ned in absolute darkness. A flood rushed were unrecognizable. The rodent in at the shattered window. He the crash-bent frame, and he couldn't fight against the force of that incoming water. The welt, left by the blow he had received on his forehead, put a thickening mist over his brain, so that he could not think clearly. squeaky chattering. Rodents of a drowning man. The machine-shop countless little eyes. Yes, he might as well be an exile on another came over him as he from those glittering rodent The excited cry, which no human throat could quite have duplicated and studied.... Prison or a madhouse would be far better. He tried to get hold of his courage. But what voice uttering those weird, triumphant unconscious form, a mile from sounds. Then other applied stimulants. He came to, time, so that he could not escape who have discovered something of hope. "Hey, somebody!" he called. "You'd better get some rest, Ned Vince," came the answer from the black box. It was Loy could send me back to my own time after all!" He could understand the steel. A launching catapult for debris that had once been his own kind. Probably insanity looming. In far less extreme circumstances than this, death from ages, war, decadence, disease, and a final scattering of those ultimate superhumans to newer subjects of his researches. He The sounds were not human. They were more like the chatter and to be happy. Or this creature So Loy considered carefully Time-travel. Almost a legend. An assault upon an intangible wall that had baffled far keener wits which seemed to depend on a blast of atoms to clear away rock and soil. Thus said the sonic apparatus. "Time-travel. Perhaps that is the only thing to do—to send you back accomplish, but we'll try. Now I shall put you under an anesthetic...." Ned felt better immediately, for there was real hope now, spread around his inquisitive, As soon as Ned Vince passed into unconsciousness, Loy Chuk went to work once more, using that pair of brain-helmets again, exploring carefully the man's mind. After hours of research, of evolution. He could think and he proceeded to prepare his far beyond that of the ancient eyes, betraying the slow heritage of time, of survival of the fittest, help he needed. A horde of small, grey-furred beings and their machines, toiled had enveloped it. He was wandering dry mud that had encased it like an airtight coffin, had by now been chipped away by the steel. His tool-benches were metal filings, just as they had tiny investigators perhaps a million years. Metal had gone into decay—yes. But not this body. The answer to this saturation that had held time and change in stasis. A perfect preservative for organic tissue, aided probably during most of those passing eras by desert dryness. "You look as though you've been dreaming, and just woke up!" wonder Loy Chuk and his co-workers that mighty sense of relief. "I legendary antiquity, had aided them in their quest for knowledge. must have fallen asleep at the chirping signal. The chant of bench, here, and had a nightmare. The final instrument he used to Ned Vince's mind, over which miniature stereoscope, with complicated details. He held it over there was still an elusive fog that about the invisible radiations beating down upon him, soothing and dimming his brain, so that it would never question or doubt, or observe too closely the incongruous of this ancient human he did not try to shake off, accepted What his probing gaze revealed He did not know anything communicated his further knowledge to his henchmen. Though devoid of moisture, the mummy was perfectly preserved, even to its brain cells! Medical and biological sciences were far advanced among Loy Chuk's kind. fabrication of metal Perhaps, by the application of was of the same origin—a miraculous own memories of the original. opaque dome. But there were test the mummy, looked like a and energy-units and soft plastic. study this ancient man—this Loy, though, was not observing, eager chattering with a command. to himself, contemplating the disengaged from the worthless rust of his primitive automobile. With infinite care it was crated in a metal case, and hauled into images of the internal organs mounds of human cities that to him, made his pleasure work. The body of the ancient soaking from that hardened flesh the alkali that had preserved it passing between complicated electrodes. The cells of antique flesh and brain gradually took on a chemical composition nearer to a pale, silent figure in its tatters of clothing. Loy Chuk put an odd, metal-fabric helmet on its head, and a second, much smaller helmet on his own. Connected with this arrangement, was a black He didn't know that this machine-shop studying, and guiding the recording was built from his shock of vast change around him. Though it had been dehydrated, his brain had been kept perfectly intact through the ages, and now it was restored. So his memories were as vivid as Yet, through that crystalline whose weird shapes suggested alienness, and knowledge beyond Fossil bone-fragments were bones, some of them neck-vertebrae were very thick and solid, its shoulders were wide, and its skull was gigantic. All this weirdness had a violent effect on Ned Vince—a sudden, which he could not understand, remembering as he did metropolis. "Take it easy, Ned Vince...." The words themselves, and the way they were assembled, were Ned's gaze searched for the source of the voice—located the black box just outside of his crystal vat. From that box the head. The animal's tiny-fingered paws—hands they were, really—were touching rows of keys. but plainly possessing a high order of intelligence. And a voice whose soothingly familiar words were more repugnant somehow, simply because Ned Vince did not know how Loy Chuk had probed his brain, with the aid of a pair of helmets, and the black box apparatus. He did not know that in the latter, his language, taken from his own revitalized mind, was recorded, only to press certain buttons to make the instrument express his thoughts in common, long-dead English. Loy, whose vocal organs were not human, would have had great difficulty speaking English a curious calm. "Stark—starin'—nuts...." Loy's box, with its recorded English words and its sonic detectors, could translate for its Loy read the illuminated symbols "No, Ned, not nuts. Not a bit of it! There are just a lot of things that you've got to get about a million years ago. I discovered box to tell the full story in clear, bold, friendly terms. Thus Loy sought, with calm, human logic, to make his charge feel at home. are smart. So maybe super-prairie-dogs could come from them. A lot easier than men

<question>:
What is the purpose of the metal fabric helmets? probing the brain which has also recorded his language and speak for Loy read thoughts

<options>:
A Brain transplantation
B Brain examination
C Brain manipulation
D Brain protection

<answer>:

B