Testosterone Is Apparently a Very Costly Hormone for Males to Produce

Testosterone is apparently a very costly hormone for males to produce and use. Why, then, has natural selection resulted in the males of some many species investing in the production and use of this hormone?

A) Because natural selection cannot override the effects of shared ancestry-because male animals share a common ancestor that used testosterone adaptively, they continue to do so today
B) Because testosterone helps ensure that males will be motivated to search for and to find all the receptive females of their species, thereby increasing the odds that the females will all be able to produce some offspring
C) Because under a variety of circumstances, the hormone makes is possible for males to be either aggressive or sexually motivated in ways that increase individual genetic success
D) Because males that are able to pay the price for producing and using testosterone are demonstrating that they are able to overcome this handicap, which means that they are genetically worthy members of the breeding stock for their population