The answer is the third one (c): seminiferous tubules.
Explanation for each option:
a. Prostate gland: Incorrect. The prostate gland is involved in producing a component of semen, but it is not where spermatogenesis occurs.
b. Glans penis: Incorrect. The glans penis is the sensitive bulbous structure at the distal end of the penis, and it is not involved in the production of sperm.
c. Seminiferous tubules: Correct. Spermatogenesis, the process of sperm cell development, takes place in the seminiferous tubules, which are located within the testes.
d. Ejaculatory duct: Incorrect. The ejaculatory duct is a passage through which sperm travels during ejaculation, but it is not where spermatogenesis occurs.
In summary, spermatogenesis occurs in the seminiferous tubules.