M: Hey, Mary! You have really been gone a long time. How did you do that? W: Hi! Well, I talked with my teachers before I left about the work I would miss. Besides, my aunt in Denver made me study a lot there. M: I thought she was your rich aunt. W: Not very. But she didn't have any children to raise, so she does have some money, even though she was a teacher. M: How was the holiday? W: Cold, at least three of the days I went. And I saw so many people on the mountain on Washington's Birthday. M: The beaches here were full on Washington's Birthday, too. It really was warm here, so lots of people went swimming. W: Well, we should have stayed home that day. There were so many people. We took the train over to the mountain, so at least we didn't have to drive. It is a good thing we did-there were so many cars and buses, and no place to park anywhere. M: Just like the beaches here., Question: What did the boy mean by saying "Mary, how did you do that"? (A) How Mary went on the holiday. (B) Why Mary went to Denver. (C) How Mary was able to miss so much school.
(C) How Mary was able to miss so much school.