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

<passage>:
Dr. David Lessing found Jack Dorffman and the boy waiting in his office when he arrived at the Hoffman Center that morning. Dorffman looked as though he'd been running all night. There were dark pouches under his eyes his heavy unshaven face seemed to sag at every crease. Lessing think we'll send a carbon copy out Chicago way. Might even persuade that puppy out there to come here and work for me—" leaving the Farm. I talk to him, I sweat him down, I do everything but tie him to the bed, and I waste my time. He's leaving the Farm. Period." "So you bring him down here," said Lessing sourly. "The worst place he could be, if something's really wrong." He looked across at the boy. "I don't want to go back to the Farm," said the boy. "You think that would make you feel better?" "It would, I know it would." Lessing shook his head. "I don't think so, Tommy. You know what the monitor is for, don't you?" "It stops things from going out." away from the Farm." I'll probably have to take him out to the Farm to shut him up." Lessing ran a hand through sparse grey hair. "See what you can do for the boy now. We could end up with a dead boy on our hands." Two letters were waiting on Lessing's desk that morning. The first was Lessing groaned. As director of psionic research at the Hoffman Medical Center, he had long since learned how administrative detail could suck up daytime hours. He knew that his real work was at the Farm—yet he hadn't even been to the Farm in over six weeks. And now, as the book Dear Dr. Lessing: In recognition of your position as an authority on human Psionic behavior patterns, we would be gratified to schedule you as principle For they were floundering. When they were finally forced to recognize plunged eagerly into the search, and found themselves in a maddening made no sense, observing things that defied logic. Natural laws came became— But now David Lessing had discovered a pathway through that jungle, a theory to work by— Master in the trembling flesh!" Lessing frowned. "Dr. Melrose, I don't quite understand—" "Oh, it's just that I'm impressed," the young man said airily. "Of course, I've seen old dried-up Authorities before—but never before "If you've come here to be insulting," Lessing said coldly, "you're just wasting time." He reached for the intercom switch. don't think I can do it, you're in for quite a dumping." Lessing sat back slowly. "Tell me—just what, exactly, do you want?" "I want to hear this fairy tale you're about to publish in the name of Lessing shouted for his girl. "Get Dorffman up here. We're going to the Farm this afternoon." The girl nodded, then hesitated. "But what about your lunch?" children theory on." "Why not?" Lessing growled. "It wouldn't be the first time the tail wagged the dog. The psychiatrists never would have gotten out of their rut if somebody hadn't gotten smart and realized that one of their new drugs worked better in combatting schizophrenia when the doctor took I'll play along." Lessing glared at him. "When we began studying this psi-potential, we more powerful and active in infants and children than in adults. Somewhere along the line as a child grows up, something happens. We have the Farm—to try to discover why. What forces that potential the high white gates of the Farm, slowing down at the entrance to a monitors required of all personnel at the Farm. They were of a "The major problem," Lessing said, "has been to shield the children "Which may not be very far." Jack Dorffman burst in: "What Dr. Lessing is saying is that they seem effective for our purposes." through an open areaway. Behind the buildings was a broad playground. A of swings, slides, ring bars and other playground paraphernalia was in heavy use. The place was teeming with youngsters, all shouting in a one waved to them as she rescued a four-year-old from the parallel bars. They crossed into the next building, where classes were in progress. "Some of our children are here only briefly," Lessing explained as they walked along, "and some have been here for years. We maintain a funds. Other children come to us—foundlings, desertees, children from broken homes, children of all ages from infancy on. Sometimes they stay until they have reached college age, or go on to jobs. As far as are strictly observers. We try to place the youngsters in positions where they can develope what potential they have— grey glass they could see three children, about four years old, playing penetrated into the children's room. There was no sign of a switch, nor a power source. As the children moved about, the screen flickered. "What are they doing?" Melrose asked after watching the children a few Lessing smiled. "This is an isolated phenomenon—it doesn't hold for any other three children on the Farm. Nor did we make any effort to place them together—they drew each other like magnets. One of our want you to watch this very closely." He opened a door and walked into the room with the children. The fluorescent screen continued to flicker as the children ran to Lessing. The children laughed and jabbered, apparently intrigued by the game he place until the tower hung in midair, clearly unsupported. The children Then, quite casually, Lessing lifted off his monitor. The children children busily putting the tower back together. There was a little "That's what I think," said Lessing. "How do you know those children didn't make you take off your monitor?" Lessing blinked. "Why should they?" suddenly, his voice earnest. "You have fine facilities here, good workers. And in spite of my flippancy, Dr. Lessing, I have never imagined for a moment that you were not an acute observer and a ." Lessing and Dorffman rode back to the Hoffman Center in grim silence. At first Lessing pretended to work finally he snapped off the tape them for all he's worth ." "But why shouldn't he?" Farm." "Yes, I know." Lessing's voice was weary. "But first I think we'd better look at Tommy Gilman, and the quicker we look, the better—" you at the Farm, but you'd already left. The boy—" She broke off children's playroom. "See what you think." The boy sat stolidly in the corner of the room. He looked up as they "Tommy!" Lessing reached out for the toy. The boy drew back in terror, clutching it to his chest. "Go away," he choked. "Go away, go away—" When Lessing persisted the boy bent over swiftly and bit him hard on the hand. Lessing sat down on the table. "Tommy, listen to me." His voice was gentle. "I won't try to take it again. I promise." "Go away." , Lessing thought suddenly. Something had suddenly gone horribly wrong—could the boy really be sensing the source of the trouble? Lessing felt a cold knot gather in the pit of his stomach. He mind. He had seen it a hundred times at the Farm. But even more—he repressed in the adult mind, crushing suddenly into the raw receptors healthy youngster could survive it, even though the scar remained. But an animal instinctively seeks its own protection The boy blinked in amazement, and pulled the grey helmet from his head. Lessing felt the familiar prickly feeling run down his scalp as the boy stared at him. He could feel deep in his own mind the cold chill care, filing them through the machines for the basic processing and drying up there on the Farm, until the distortion was threatening the ?" Lessing burst out. "Didn't you see how he acted

<question>:
How did the children come to be at the Farm?

<options>:
A Dr. Lessing bought them from their parents.
B Some children are sent to the Farm by their parents for boarding school. Others are orphans and runaways.
C The children come from migrant and refugee camps.
D Dr. Lessing bought them from human traffickers.

<answer>:

B