Exercise provides a healthy outlet for feelings, which improve
a.
emotional health
b.
mental health
c.
spiritual health
d.
environmental health

The answer is A. because the definition of Emotional health is about being happy, self-confident, self-aware, and resilient. People who are emotionally healthy are able to cope with life's challenges and recover from setbacks. But health –including mental and emotional health - requires knowledge, understanding and effort to maintain.   

This sentence Is another example of those things. 
In short your answer is Choice A.

Hoped This Helped
Happy Studying!

The answer is A. hope this helps

Yes you do , which is cool