Answer:
D. All of the above
Explanation:
Exercise improves mental health by reducing anxiety, depression, and negative mood and by improving self-esteem and cognitive function. Exercise has also been found to alleviate symptoms such as low self-esteem and social withdrawal.
From this description you can see that exercise is beneficial in all three options.
Sharma, A., Madaan, V., & Petty, F. D. (2006). Exercise for mental health. Primary care companion to the Journal of clinical psychiatry, 8(2), 106. https://doi.org/10.4088/pcc.v08n0208a
