Please answer the following question: "Daddy, how much money do you make an hour?" "If you must know, I make $20 an hour." "Oh," the little boy replied, with his head down.He thought for a moment, looked up and said, "Daddy,could you lend me $10?" The father was _ , "If you asked for the money to buy a toy or some other rubbish, then go straight to your room and think about why you are being so selfish!" The little boy quietly went to his room and shut the door. After about an hour or so, the father calmed down, and started to think, "Maybe I was too hard on you just now." said the man, "Here's $10." "Oh,thank you,Daddy!."he said happily.Then, the boy took out some coins.When the father found that the boy already had money, he got angry again. "Why do you want more money since you already have some?" the father shouted angrily. "Because I didn't have enough, but now I do."the lillte boy replied, "Daddy, I have $20 now.Can I buy an hour of your time? Please come home early tomorrow.I would like to have dinner with you." The boy wanted to buy _ with twenty dollars. A) a new book for himself B) a nice present for his father C) a toy for his own birthday D) an hour of his father's time
A:
D