A girl wants to improve her fitness level by playing basketball every day. She has set short-term goals to play 30 minutes a day by the end of the first week, 40 minutes a day by the end of the second week, and so forth.

What is an appropriate long-term goal for her ?

A. To play one hour a day by the end of the month

B. To play two hours a day by the end of the month

C. To play three hours a day by the end of the month

D. To play four hours a day by the end of the month