阅读下面材料，从每题所给的A、B、C、D四个选项中，选出一个最佳选项。

    Mum gives little Tom ten yuan. Then little Tom goes shopping. He gets on a bus and its down next to an old woman. Then he sees the old woman's handbag is open.

    There is ten yuan in it. He quickly looks into his pocket(口袋).The money(钱)isn't there now! Little Tom is that the old woman is a thief(小偷). He decides to take back the money from the old woman's bag. He carefully puts his hand into the old women's bag, takes the money and says nothing. Suddenly, the old woman shouts, "Where my money? I can't find it. There is a thief on the bus. "Little Tom feels strange(奇怪的).Then he sees ten yuan under his seat. Little Tom is thinking a question now, "Am I a thief?"