Answer the following question: I'm taking a test and have to guess the right answer to the question after the article. Article: Long long ago, there was a man who lived in a village. One day, he went to a market and did some shopping. He suddenly found two boxes. Both the two boxes were very beautiful and the man fell in love with them at the first sight. So he bought them. After he got home, he didn't know how to use the boxes. He thought it over and decided to do something special. He decided to put all of his happiness in the yellow box and all of his sadness in the black box. He thought that it was funny to do that. A few days later, the yellow box was very heavy, but the black box was still light. He didn't know why. He decided to open the two boxes and found out the truth. He opened the yellow box and found nothing. Then he opened the black box and saw a hole at the bottom. Then he smiled to himself and said, "Happiness is for me. Let sadness go." Question: He put his happiness into _ . Options: A: the red box B: the yellow box C: the black box D: the white box
Answer:
B