Whether a person needs a sports drink during exercise depends on her a person needs a sports drink during exercise depends on a. what time of day the person is working out.
b. whether the person ate breakfast that day.
c. the amount that he or she sweats.
d. the type of exercise being performed.

Well it does not matter what time of the day it is, so it is not A. I think that that B is a possible answer but I think that it depends on the person. I think C makes the most sense so far so lets read the last one to make sure. I don't think it matters what exercise is being performed so it is not D. So after observing the question, The best answer would be C.
Hope This Helps!

I think its c it sounds like the best anser

Animals will lose energy because it is converted to heat