The main function of male gonads is to produce gametes and hormones. In males, the gonads are called testes and they produce sperm cells (male gametes) and hormones like testosterone. Gonads (testes in males) are under the control of tropic hormones produced by the brain/pituitary.
GH (C) or Growth Hormone has little direct connection with the activity of testes. GH is more connected with the development of body (the somatic part) on the whole.
Therefore, option C is incorrect.
Testis is under the influence of both FSH (Follicle Stimulating Hormone, option A) and LH (Luteinizing Hormone, option B). In males, LH is also called interstitial cell-stimulating hormone and it stimulates Leydig cells production of testosterone. It acts synergistically with FSH, which acts on Sertoli cells to stimulate sperm cell production.
Therefore, option (D) is correct.