Final answer:
Interstitial cells, also known as Leydig cells, respond to luteinizing hormone and produce testosterone, encompassing the roles described in options A, B, and C.
Step-by-step explanation:
Interstitial cells, also known as Leydig cells, are found between the seminiferous tubules in the testes. These cells respond to luteinizing hormone (LH) which stimulates them to produce and secrete testosterone, an essential hormone in the development and maintenance of male secondary sexual characteristics.
The regulation of testosterone production by Leydig cells involves a cascade starting with the release of gonadotropin-releasing hormone (GnRH) by the hypothalamus, which then prompts the anterior pituitary gland to release LH.