Answer: A. Food
Explanation: B. would be wrong cuz music can't harm you it just makes you want to do more and has a awesome beat to it. C. would be wrong cuz it' ok if you reward yourself with a new pair of shoes cuz then you get more comfort. and D. is wrong because reading a book is healthy for your mind
A. is correct because eating after a workout is not good it may ruin your fitness goal
Hope this helps^^