Identify the correct option (A), (B), (C), (D) with respect to spermatogenesis. [2024]

(1)
Spermatogenesis starts at the age of puberty due to significant increase in the secretion of gonadotropin releasing hormone (GnRH). The increased levels of GnRH then acts at the anterior pituitary gland and stimulates the secretion of two gonadotropins – luteinising hormone (LH) and follicle stimulating hormone (FSH). LH acts at the Leydig's cells and stimulates the synthesis and secretion of androgens. Androgens, in turn, stimulate the formation of spermatids. FSH acts on the Sertoli cells and stimulates secretion of some factors which help in the process of spermiogenesis.