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

<passage>:
past. Joe didn't know how they'd to adapt. There didn't seem to be any hurry. Once the deal was made, they left it up to him to make the decisions. Joe Prantera as it had in his own time. Oceans, mountains, and to a lesser extent, deserts, are fairly permanent even way it always did. The older man stopped and against man's corroding efforts. Joe said, "How about Mexico? Could squinted, but not suspiciously, even Joe Prantera said impatiently, "The And he pressed the trigger. And at that moment, the universe America has been united into one unit. Today, there are only eight nations in the world." caved inward upon Joseph Marie There was a falling through all space and through all time. There was doubling and twisting and twitching of every muscle and nerve. "That's a helluva long way to go on a get." Joe eyed him in scorn. "Oh, you There was pain, horror and tumultuous "We hadn't thought of the matter "Mr. Prantera, this will probably be difficult for you to comprehend, "If I understand your idiom correctly, you mean prison. There are no prisons in this era, Mr. Prantera." wrong, too. For the first time, Joe wrong. The other spoke precisely and Joe had given up. Now he merely slowly, the way a highly educated man speaks a language which he reads and writes fluently but has little occasion time to financial matters in all their endless ramifications—including bank robberies—as we were to productive efforts. So we turned to more efficient methods of distribution." On the fourth day, Joe said, "O.K., let's get down to facts. Summa the Joe couldn't figure out how he Salviati happened to be Joe's mother's Joe had been born in Naples and his father hadn't brought him to the Rossi. My finger, he works in Rossi's house, see? He lets me know every Wednesday night, eight o'clock, Al leaves the house all by hisself. O.K., so I can make plans, like, to give it flatly, "or let me outta here." Joe gingerly tried swinging his Lawrence Reston-Farrell said, "You are not being constrained. There are Brett-James said, "Why not just go "Jest walk in, eh? You think I'm stupid? How do I know how many the other stood watching him, strangely. He came to his feet. With the exception door sliding back into the wall in much the same manner as the room's Joe Prantera scowled and said, Joe was indignant. "Just like that, and then stepped to the window. He couldn't figure the other. Unless he so quick—" "See here, Mr. Prantera," Brett-James said softly. "We no longer have And for a moment again, Joe Prantera He stared for a long, long moment. The cars didn't even have wheels, he noted dully. He turned slowly and Joe scowled. "You said they didn't Prantera. "I wanta get out of here," Joe said. "Where would you go?" There was nothing else to do. Joe won't rat on you?" after you have accomplished your mission, we plan to turn ourselves Joe said, "I think maybe I'll take and then something else Joe didn't is a unique animal. Physically he matures at approximately the age Joe didn't allow himself to think and adjustment is often not fully realized until thirty or even more. Indeed, it is sometimes never of thirteen. However, mental maturity you, I suppose one might longer in Los Angeles—" the year—" Brett-James looked at his companion. "What is the date, Old screws everything up. But the way things are, there's no way of making Joe Prantera looked from one of are confusing you. Briefly, we have the year 1960, you are now in the transported He let the sentence fall away as he realized the impossibility. Brett-James said gently, "Hardly for one hundred and seventy years, Mr. Prantera." that once confused the race with their limitations as a means of communication." Joe demanded, aghast. "You mean there's no place in the say, from your own era to ours." Joe Prantera had never been exposed to the concept of time travel. He had simply never associated with Reston-Farrell said, "I am afraid we considered such an idea. Now he said, "You mean, like, I been asleep all that time?" to fit it, but that problem too frowning. Reston-Farrell said, "Suffice to say, you are now one hundred and seventy-three years after the last memory you have." Joe Prantera's mind suddenly reverted had been solved. out. He knew it wouldn't have If they allowed him to call it off today, taken much for them to cancel the Besides, already Joe was beginning Joe was coolly efficient now. He Joe Prantera came abruptly to his feet. "I'm gettin' outta here." For the second time, Reston-Farrell pulled out the automatic, held it again, as abruptly as he'd arisen. "Let's start all over again. I got this straight, you brought me, some screwy way, all the way ... here. room but they left on Joe's The two men of the future said nothing more for long minutes while Joe Prantera's mind whirled its confusion. Joe said, "Joseph Salviati-Prantera remember that at the point when we ... transported in the room. Joe Prantera ignored it They had him pegged all right. Joe this age, nor have there been for over a century and a half." "Well, then do it yourself." Joe Prantera's irritation over this whole Giovanni's. Right now he could have windows. He looked out, as though unseeing. Then, his back turned, he said, "We have tried, but it is simply not in us, Mr. Prantera." "No, if by that you mean afraid. It is simply not within us to take the two." THE END Transcriber's Note: again." Joe snapped: "Everything you guys say sounds crazy. Let's start all over 1960. Extensive research did not uncover any evidence that the U.S. Just as we are today and just as nations were a century or a millennium ago." and a half ago our society eliminated the reasons for international conflict. For that matter," he added Shortly after your own period, man awoke to the fact that he had achieved to the point where it was possible to produce an abundance for all with a minimum of toil. Overnight, for all practical purposes, the whole world was industrialized, automated. The second industrial revolution was accompanied by revolutionary changes in almost every field, certainly in every found, Mr. Prantera, that it is difficult for a man to be free so long as others are still enslaved. Today the democratic ethic has reached a pinnacle era." "O.K., O.K.," Joe Prantera growled. Joe Prantera scowled at him emptily. Joe growled. "I ain't stupid." not considered." time we did, do you realize what would have happened?" "Sure," Joe grunted. "I woulda let five times. Then I woulda took the plane back to Chi." law of the period, your life would have been forfeit, Mr. Prantera." Joe winced. It didn't occur to him your present—" "Waita minute, now. You figure on Brett-James was shaking his head again. "I am afraid there is no return, Mr. Prantera. Time travel works but in one direction, with the flow of the time stream. There can be no return to your own era." Joe Prantera had been rocking with the mental blows he had been assimilating, but this was the final haymaker. He was stuck in this Careful, painstaking, competent. He spent the first three days of his with him. Joe didn't meet any of the them to bring Joe from the

<question>:
Why can't Joe go back to 1960?

<options>:
A Temple-Tracy destroyed the vortex manipulator.
B The time circuits were damaged when they brought Joe into the future.
C Temple -Tracy destroyed the time transmitter.
D Time only moves one way.

<answer>:

D