Given the question: Read the article and select the best answer. Article: Mr. Smith drives his car to meet his friends at the station. When he finds there is still quite some time to go before the train arrives, he wants to take a short sleep. He is going to sleep when a young lady comes and asks him the time. Mr. Smith opens his eyes and answers, "Half past eight." With a "Thank you" the woman leaves. In a short time, this happens three more times, so Mr. Smith writes "I don't know the time!" on a piece of paper and puts it on the window of his car. But only a few minutes later, an old man comes and wakes him up. "Hi, young man. I can tell you the time. It's nine o' clock." Question: Mr. Smith writes a note on _ . Options: A: a piece of paper B: the window of his car C: his car D: the wall
The answer is:
C