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

<passage>:
THE GIRL IN HIS MIND places in which he can hide—even from himself! The dance that the chocoletto girl was performing was an expurgated version of the kylee sex ritual which the Louave maidens of Dubhe 7 practiced on the eve of their betrothal. Expurgated or not, however, it was still on the lascivious side. The G-string that constituted the chocoletto girl's entire costume put her but one degree above the nakedness which the original dance demanded. Nathan Blake's voice was Blake resumed watching. The girl's movements were a delicate blend of next to match the furious bump and grind of her hips. For a chocoletto the word "chocoletto", coined by the early beche-la-mer traders, was misleading, and few of the natives of Dubhe 4's southern-most continent lived up to it completely. She was beautiful too. Her high-cheekboned face was striking—the eyes He beckoned to her when the dance was over and, after slipping into Blake nodded. "If you are free." and stood up to leave. "I will meet you there in an hour," she said. Her hut was as good a place to wait for her as any. After buying a bottle of native whiskey at the bar, Blake went out into the Dubhe 4 night and made his way through the labyrinthine alleys of the native sector. In common with all chocoletto huts, Eldoria's was uncared for booting him out into the alley. Instead he found a young girl— wait for Eldoria?" she asked. Blake nodded. "And you?" Dubhe 4. They died of yellow-water dysentery before their indenture ran out, and in accordance with Interstellar Law I was auctioned off along with the rest of their possessions. Eldoria bought me." Five years as a roving psycheye had hardened Blake to commercial "How old are you?" Blake asked. "Fourteen." "And what are you going to be when you grow up?" "Probably I shall be a psychiatrist. Eldoria is sending me to the "I see," Blake said. He indicated the book on her lap. "Homework?" "I'm sure you will be," Blake said, looking at the arras. "Nathan," Blake said. "Nathan Blake." flamed in Blake's cheeks, and for a moment he considered leaving he remembered Eldoria's dance, and he went right on sitting where he of the neck. He shifted uncomfortably on the guest mat. She had taken up the Anabasis tapestries that adorned all four walls. The sleeping dais was oval and took up nearly half the floor space. It was strewn with scarlet cushions. Blake sat down upon it. Nervously he watched Eldoria slip out of her "It's not that so much," Blake said. When he reached the alley he began to run, and he did not stop running notoriously steep. Blake was breathing hard when he reached the crest. image extended for no more than half a mile, but Blake was annoyed After resting for a few minutes, he descended the hill and started materialization, and his quarry's footprints stood out clearly in the Sabrina York did not even know the rudiments of the art of throwing had, for twelve years as a psycheye had taught Blake all the tricks. in her tracker's mind was in itself a sufficient guarantee of her safety. After all, she had no way of knowing that he had discovered her where Blake had lived at a much later date. In reality, the places were Sabrina's footsteps led up to the front door, and the door itself was Blake. At Blake's entry he went right on smoking and watching as though that constituted Blake's mind-world ceased to be. Ironically, he was crash several years ago—and for a long while Blake did not move. mistake: the first word was "Sabrina", and the second was "York". had been common practice for centuries. Even a name like "Sabrina he left the kitchen and climbed the stairs to the second floor. He went through each room systematically, but saw no sign of Sabrina York. He lingered for some time in his own room, wistfully watching his fifteen-year-old self lolling on the bed with a dog-eared copy of The Galaxy Boys and the Secret of the Crab Nebula , then he stepped back to match. He gasped. It simply hadn't occurred to him that his pursuers leaving the house by way of the back door. He picked up Sabrina's trail in the back yard and followed it down to the Martian waterway and thence along the bank to where the waterway ended and a campus began. to revisit, nor a moment that he cared to relive, but Sabrina's trail traced green arabesques against the blue June sky. A set of footprints slightly deeper than its predecessors indicated that Sabrina had paused by the trunk. Despite himself Blake paused there too. Pain Blake Past shook his head. "Proms aren't for parents. You know that he got to take me! Did he scrimp and go without "Please," Blake Past said, desperation deepening his voice. "You're "I'll come to New Earth to visit you," Blake said. "Venus is only a few Blake Past stood up too. "No, not yet. I'll walk back to the sorority Blake Present watched them set out side by side toward the remembered register on Blake Past's mind, they did not exist for Blake Present. All that existed for Blake Present were the diminishing figures of the at his feet and knew that his pursuers had at last caught up to him. well-adjusted as he considered himself to be. The three women standing before him definitely were not memory-images. They were too vivid, for And what were they doing in his mind? unison: "You know who we are, Nathan Blake. Blake stared at them open-mouthed. Then he turned and fled. patient's boyhood, and its country proved to be the country of the patient's mind. After many trials and errors, Trevor managed to get both himself and his patient back to the objective world, and not long afterward he was able to duplicate the feat on another case. It was inevitable that sooner or later some criminal would hit upon Blake was one of a long line of such operators. a superb stratagem indeed if, shortly after her entry, Sabrina York the place-time materialization of the little office Blake had opened hadn't constituted a sentimental memory. Whenever Blake accepted a case done so after accepting his case—or was it before? He couldn't quite remember—the mental picture that had come into his mind had revealed was hiding out in his mind. Retiring to his bachelor quarters, he had entered at the same place-time and set off in pursuit. Her only advantage lost, Sabrina York was now at his mercy. Unless she discovered his presence and was able to locate his most recently materialized place-time before he over-took her, her capture was Only two things bothered Blake. The little office was far in his past, her wherever she went. And once, after tracking down an ex-enlisted barracks with a ten-star general waiting on him hand and foot. But these, and other, similar, cases, had to do with mal-adjusted people, that Blake was less well-adjusted than he considered himself to be, why They followed him off the campus into a vicarious memory-image of Blake went on. Presently the Walden Pond memory-image gave way to a aside as a memorial to the English poets and which had impressed Blake enough, it was Burns's birthplace that had impressed Blake most. Now Sabrina York must have been attracted to the place, for her footprints and let herself in the door. They also showed that she had left by the same route, so there was no reason for Blake to linger. As a matter of fact, the fascination that fascination, and Blake not only lingered but went inside as well.

<question>:
Where did Blake begin his chase of Sabrina?

<options>:
A By the lake
B At his parents' house
C In his apartment
D On Dubhe 4

<answer>:

B