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

<passage>:
"They look pretty complicated." Rootless and footloose, a man in space can't help the seal. "I'm afraid I don't understand." was not impressed. He vaguely wondered if the little drama of the "It ain't notched." so damn notched," he complained. "You ought to take care of that card "Mike?" "All right, mister, three units, then. I wasn't trying to hold you up." "You mean a microphone?" asked Craig, mechanically fishing for his wallet. "Sure, they don't put in screens here. Wanted to, but the boss "You know, the mike." the envy of the others. Grav 1—that meant Terra. He crossed the long, He was too puzzled to wonder what he was expected to do with the information. "Your service tapes," the next noncom said. "Where you going?" "I can get you a sensatia-tape," whispered the boy when they had small instrument, "Air-lock ahead and to your right. Strip and follow the robot's orders. Any metal?" "You know, metal ." "Well, my identification key." It had been a weird day and he had not liked it. There was no telling had called it. One thing was sure: Terra aggressively went after its personnel and felt the impotence of a spaceman who had long forgotten the bureaucracy of a rear area base. The knowledge that much of it was jacket. Its incredibly fine-grained leather would carry none of the appropriate it. He would never know the beautiful, gentle beast that to hate a robot, but one could certainly hate those who set it into operation. "You will find a red button at your feet. Lower your head and depress that button." pliant as before. pain, but it is necessary to treat the small injury you have been disregarding." respect for the robot-controlled equipment of bases had risen. When flesh-colored plastic material. He dressed quickly and was on the verge of asking the robot for had intended. aggressive after Clerical, eh?" "I'm a little anxious to get home, I suppose," said Craig defensively. about him. "We might say you've been away quite a while, eh?" "You mean you haven't been in a gravity system?" torture system here is psych." "So I gathered." The worst is over. Short of Gravitational conditioning, there is "Sorry, I guess I'm a little touchy. This is my first time...." "Quite natural. But it being your first time—in quite a number of conditioning." "Yes. You have spent eleven years in space. Your body is conditioned to a normal state of free fall, or at best to a state of acceleration." "Yeah, I know. Once on Gerymeade...." "You were ill, couldn't keep your balance, felt dizzy. That is why all spacemen carry PON, paraoxylnebutal, with them. It helps suppress certain physiological reactions to an entirely new set of conditions. Channels of the ear, for example. They play an important part in our awareness of balance. They operate on a simple gravity principle. Without gravity they act up for a time, then gradually lose function. Returning to gravity is rather frightening at first." "It meant more than that. There were excellent psychological reasons about the "freedom of open space." He spoke repetitiously of the intolerable. cumulative effect of a gravity system, he could not understand the really knew very much about Terra. So what? I know it won't be as it can't—tell me why. I've got a damned good job there—" time." "Sure. What else can it be?" On the eighth day, two attendants, who showed the effects of massive doses of PON to protect themselves from the centrifugal force, "The twelfth day is the worst," a grizzled spaceman told Craig. "That's when the best of 'em want out." "How ... how do they know when you ought ... to come out?" he asked "Blood pressure. They get you just before you go into shock." "That strap around your belly. You mean you ain't noticed it?" "Haven't noticed much of anything." "Well, it's keyed to give them some kind of signal." desperately wanted something to distract his mind from the ghastly conditioning process. "Dropped ... it ... down?" "Can't they ... drop it down continuously?" wadding. "... got it bad." "... pretty bad." "He'll go into shock." "... never make it the twelfth." white-clad figures, ridiculously out of proportion, hovered wraithlike over him. Four elongated eyes peered at him. had begun to produce ultra-sonic waves. Craig was not sure. Most of the men had passed through the torments of gravitational conditioning. The huge headquarters base centrifuge aboard the man-made satellite had gradually caused their bodies to respond once more to a single source of pull. They were now ready to become inhabitants of On the eighteenth day, automatic machinery freed them from their and joked about it and kidded those who were slow at adjusting. free-fall flight to Terra. "Space article violator," the old man informed Craig. "Psycho, I think. Went amuck with some extraterritorials. Killed a dozen." "What will they do, exile him?" "Not to Chociante, if that's what you mean. They just jerked his space "And spend your weekends on Luna." "Whereabouts?" "Not much." a long time, old man, this hitting atmospheres all over the Universe." personal belongings from a kit. "What are you doing in Grav 1?" Craig asked. down. Now they got some fancy psychology name for it." "But space is different. Space is raw and new. It tugs at your guts. It out of you, leaves you brittle and old—old as a dehydrated piece of " You can't figure it. Some of 'em urp all over and turn six shades of " " " " " " " " " " " " " " He probably outlived everybody that ever knew him. " " " difficult to fit into the place he had made for it. Exasperated, he irradiation. Probably in another ten years his son-to-be would put it what a stinking life it was. It was the signal for relief in the passengers' quarters "Who's it from? Somebody on Terra?" " " transcriber. But then he noticed the card bore only a few irregular me out across the Galaxy, while she's home. Go see her if you can, son. Will you? Make sure she gets the unit imagination that long ago. He must have been in on the first Cetusian impressions. One day he would recall this moment, his first on the planet Terra. He tried to recall his first thrill at seeing Los atmosphere. "A moment, sir. Just a little greeting from the Terra. You understand, of course. Purely routine." we believed for a minute, you understand ... purely routine." him. "Customs. Bet you never got such a smooth screening before, eh?" "You mean he me? What for?" get it over with quick." first physical contact with Terra had passed unnoticed. "You dropped this, sir. Quite by accident, of course." nor trace of dirt. The Import personnel man was toying with a small chip of gleaming "Yes, naturally." "Thought you could give me some idea of conditions...." "Conditions?" part is closest to where I'll work." seated uncomfortably in the silent room. There was a distracted quality find it very strange here." "Yes, so big. And also...." He seemed to consider many words before completing the sentence. "And also different." a planet. As an adult, anyway." much the same way we would an extraterrestrial." The statement was delivered in an almost exaggeratedly casual tone. "Will he need a food and—clothing ration also?" asked the girl, you couldn't be expected to be familiar with Terra's fashions. In your made uncomfortable." "A hick," he supplied. business suit. He amused himself by calculating stress patterns in its plain woven material as she assembled the forms for him.

<question>:
Sensatia most likely refers to ________.

<options>:
A illicit drugs
B microphone shorters
C pornography
D virtual reality equipment

<answer>:

C