Which description best defines heatth

The answer is C
Which description best defines health? 
a.being physically fit, eating a good diet, and not having any major diseases b.being in the middle, rather than at either extreme, of the health continuum c.maintaining a balance of physical, mental/emotional, and social well-being
d.eating well, having friends, liking yourself, and living for a long time

C= $20.45, you do how many songs multiply that by each song cost and add $9.95