Q:I'm taking a test and have to guess the right answer to the question after the article. Article: Tom was ten years old and he was a very lazy boy. He didn't like doing any work. He had to go to school, of course , but he didn't study hard there and tried to do as little work as possible. His father and mother were both doctors and they hoped that their son would become one, too. But one day Tom said to his mother, " When I finish school, I want to be a dustman." "A dustman?" his mother asked, she was very surprised. " that's not a very pleasant job, why do you want to be a dustman?" "Because then I would only have to work one day a week." Tom answered at once. "Only one day a week?" his mother said, "What do you mean? And how do you know?" " Well," Tom replied, " I know that the dustmen who come to our house to work on Thursday, because I only see them on that day." ,,. Question: Why did Tom think that dustmen only worked one day a week? Options: A: Because Tom heard of this before. B: Because one of the dustmen had told him before. C: Because Tom had seen the dustmen only on Thursday at his house. D: Because Tom's mother told him.
A:
C