Manny had Bob Marley cranking on the stereo, his van was full of passengers, and the air conditioning was working after a long week of giving him trouble. The sun beat down on the wet-looking asphalt road that ran along the harbor, next to the concrete waterfront. It curved along in front of the brightly colored Dutch Colonial warehouses of Charlotte Amalie, which were now converted restaurants and jewel shops. Tourists in day-glo shirts and daubs of sunscreen rubbed over peeling skin crowded both sides of the waterfront road. Manny slowed somewhat, keeping an eye on them. On the sidewalk by the shops a tall black man stood by a food cart. The hand-painted wooden sign hanging from the cart's side had faded letters. The man wore a grand suit with tails, like an orchestra conductor, and a top hat perched on his shaved head. A cigar burned in his mouth. For a brief second he held Manny's attention. Then the food cart's owner stepped forward and the strangely dressed man disappeared. Manny looked at the other side of the road. A white girl with oval shaped sunglasses and pink leather pants stepped off the sidewalk into the road in front of his van. He slammed on the brakes, trying to dodge her, but the van couldn't respond that fast. Her ponytail flew up towards the windshield and her head struck the star-shaped hood ornament. She bounced along the asphalt. Manny weaved the van to a stop, with swearing from the passengers in the back. He opened the door and stepped out into the heat. Get up, stand up, the radio cried out, and that was what Manny hoped would happen. He hoped that she would at least just stir and be okay. But she just lay there. Question: Why did Manny slow down? === The answer to the above question is
pick from the following.
 A). not enough information;
 B). the food cart owner stepped forward;
 C). the boy stepped off the sidewalk;
 D). tourists were on the road;
Answer:
D).