The correct option is
A To change one's behaviour for the better
The given phrase means 'Start to behave in a better way'.
Option A is correct. It has a similar meaning to the required meaning. Thus, it is the correct answer.
Option B is incorrect. The given phrase has nothing to do with reading. Thus, it is incorrect.
Option C is incorrect. It means 'to stay alert'. Thus it does not have the required meaning.
Option D is incorrect.The phrase has no connection to raking leaves. Thus, it is incorrect.