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.

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Happy Studying!

The answer is A. hope this helps

Smoking damages the respiratory system by inhalation of a foreign substance, that is absorbed and residue is left behind on our lungs sponge like substance. the gas that is inhaled also increase your blood pressure and dilates your blood vessels. also the process of inhaling and exhaling the smoke it causes irritation to the throat and mouth. smoking can cause lung cancer and other respiratory and circulatory diseases.