Function of testosterone

The correct option is A Controls sperm production
Testosterone is the most important androgen (male sex hormone) in men and it is needed for normal reproductive and sexual function. Testosterone is important for the physical changes that happen during male puberty, such as development of the penis and testes.Testosterone also acts on cells in the testes to make sperm. LH( Luteinizing hormone) is needed for the Leydig cells in the testes to make testosterone, the male sex hormone. Testosterone and FSH(Follicle Stimulating Hormone) from the pituitary gland then act together on the seminiferous tubules (sperm-producing tubes) in the testes to make sperm.

So, the correct answer is "Controls sperm production".