Please tell me the answer

C

Explanation:

Sunshine provides vitamin D and makes us feel good, which is out of the 4 answers the most accurate.

It would not be A or D because they are not good reasons as being awake during the day and option B is the opposite of what we are trying to find.

a. all of the other answers have at least one capitalization error.

no its not a run on sentence however i think you meant wet suits not sours also a run on sentence would be like surfers surf all winter long in southern california by using wet sours to keep them warm and the live their all year long