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

<passage>:
How? Tennant did not know. Perhaps as a man can cut finger or even throat on the edge of a near-two-dimensional piece of paper. It took valor for them to hunt men in the world of men. In that fact lay a key to their character—if such utterly alien creatures could be said to have character. The house was furnished with all "Waiting for me?" Tennant asked the girl. She said, "I'd rather be dead. Maybe I am. Maybe we're all dead and this is Hell." within them by their captors. They walked toward the house. They entered the house, which had no roof, continued to move beneath a wasn't. It was a prison, a cage. The other two women were sitting in the heptagonal central hall. Eudalia, who had borne twin girls recently, was lying back, newly thin double motherhood, she was almost flat of bosom. He asked her how she a female foreman in a garment-cutting shop before being captured and the three female captives, barely nineteen. But with the eyes of the other two, especially Dana, upon him, he could not. in a harem, even when it's supposedly my own." McManus and the girls in the family entrance of Conaghan's Bar and it—are they—real?" "As real as you or I," he told her. "It took quite a bit of doing, aroma of steak, it was almost tasteless. This was so with all of their foods, with their cigarettes, with everything in their prison—or their cage. Their captors were utterly without a human conception of smell, living, apparently, in a world without odor at all. things are arranged here." "Thanks, Eudalia," said Tennant. "I think I can defend myself. But she's right, Dana. We're as helpless as—laboratory animals. They have the means to make us do whatever they want." scientific sense, because we don't seem to have moved in time. I wasn't sure of that, though, till we got the radio." "Why haven't they brought more of us through?" Eudalia asked, tamping out ashes in a tray that might have been silver. "I'm not sure," he said thoughtfully. "I think it's hard for them. They have a hell of a time bringing anyone through alive, and lately they haven't brought anyone through—not alive." "Why do they do it—the other way, I mean?" asked Dana. Tennant shrugged. "I don't know. I've been thinking about it. I suppose it's because they're pretty human." " Human! " Dana was outraged. "Do you call it human to—" "Hold on," he said. "They pass through their gateway to Earth at considerable danger and, probably, expense of some kind. Some of them don't come back. They kill those of us who put up a fight. Those who don't—or can't—they bring back with them. Live or dead, we're just laboratory specimens." "Maybe," Eudalia conceded doubtfully. Then her eyes blazed. "But the Eudalia took him to the nursery. He was irritated now in another, angrier way. The infants, protected by cellophane-like coverlets, were asleep. her close, although neither of them felt desire at the moment. Their captors had seen to that it wasn't Eudalia's turn. Tennant said, "I wish I could do something about this. I hate seeing Dana so bitter and Olga so scared. It isn't their fault." "And it's not yours," insisted Eudalia. "Don't let them make you think it is." "I'll try not to," he said and stopped, realizing the family party was teleportation ... if that were the word. It was neither pleasant nor unpleasant it The captor Tennant called Opal Communication was telepathic. Tennant could have yodeled or yelled or sung his role was to be. He had little time to speculate before Opal seemed to envelop him. There was the blurring wrench of forced teleportation and they were in received quick reproof that made his head ring as from a blow. He asked Opal where and when they were going, was informed that he would soon emerge on Earth where he had left it. That told him everything but the date and season. Opal, like the rest of the captors, hadn't seen her in—was it more than a year and a half on Earth? He could have controlled his heartbeat with one of his new powers, but the room that was so important a part of his life. The three women back leave them there, then knew that he would try somehow to get them out. Not, of course, anything that would endanger his remaining with Agatha the only way his captors would get him back would be as a taxidermist's specimen. He realized, shocked and scared, that his thoughts of escape had his thoughts. Because he felt sure of his captive ... or because he couldn't on Earth? the ebony-and-ivory elephants that Agatha had never liked were gone, but he'd get them back or another pair. The credenza had been replaced by a huge and ugly television console. That, he resolved, would go down in the cellar rumpus room, where its bleached modernity wouldn't clash with the casual antiquity of the living room. Your wife and a man are approaching the house. The thought message from Opal crumbled his illusion of freedom. He sank down in a chair, trying to refuse to listen to the rest of the command: You are to bring the man through the gateway with you. We want another he had mastered teleportation, it was incredible how much easier it was in his own world. He had covered the two miles from the gateway to the it would be you." " alive !" "Roger," repeated Tennant viciously. He felt sick with disgust. Maybe it was, with all of them going through their paces like a trio of Women have waited longer than eighteen months. He would have if his captors had let him. "Where in hell been any lately?" "Not for over a year," Cass told him. "They never did get the devil who skinned those bodies and removed the heads." So, Tennant thought, they hadn't used the gateway. Not since they had brought the four of them through, not since they had begun to train him for his Judas ram duties. of her. Cass Gordon— It didn't have to be anybody at all. For it to be Cass Gordon was revolting. "Rog," she said and her voice trembled, "what are we going to do? What "You bastard," said Cass. "You dirty bastard! You know what a wait like that could do to us." "Tristan and Isolde," said Tennant, grinning almost happily. "Well, easier and pleasanter than he had expected. They deserved some of the suffering he had had and there was a chance that they might get it. Tennant knew now why he was the only male human the captors had been able to take alive. Apparently, thanks to the rain-slick road, he had run the sedan into a tree at the foot of the hill beyond the river. He had been sitting there, unconscious, ripe fruit on their doorstep. They had simply picked him up. Otherwise, apparently, men were next to impossible for them to capture. All they could do was kill them and bring back their heads and hides as trophies. With women it was different—perhaps the captors' weapons, whatever they were, worked more efficiently on females. A difference in body chemistry or psychology, perhaps. More than once, during his long training with Opal, Tennant had sent questing thoughts toward his captor, asking why they didn't simply set up the gateway in some town or city and take as many humans as they wanted. simply wasn't feasible—and furthermore he derived an impression of the tenuosity as well as the immovability of the gateway itself. They could be hurt, even killed by humans in a three-dimensional world.

<question>:
Why are there three women and one man in the home?

<options>:
A the other captives had killed themselves before this
B they wanted extra women to make more babies
C it's the correct number they want for their social experiment
D they were the only people the aliens had been able to bring back alive

<answer>:

D