[听力原文]M: How long does it take you to get to workW: It’s only a 15-minute bus drive early in the morning. But coming home at the end of the day is quite different. Then it takes at least 20 to 30 minutes. How much time does the woman spend in traveling from her home to work in the morning（）

A. 20 minutes.
B. 15 minutes.
C. 20 to 30 minutes.
D. 50 minutes.