Answer: d. spermiogenesis
Step-by-step explanation:
Spermatogenesis is a process that occurs in the testicles, the male gonads. The cells of the testicles are organized around the seminiferous tubules, in which the sperm are produced. Testosterone is secreted by interstitial cells. Surrounding the seminiferous tubules are the Sertoli cells responsible for nutrition and support of the germline cells, that is, those that will generate the sperm. Spermatogenesis is divided into four phases, but we will be looking only at one stage to answer this question:
Spermiogenesis: It is the process that converts spermatids in sperm, losing almost the entire cytoplasm. The vesicles of the Golgi complex fuse together, forming the acrosome, located at the anterior end of sperm. The acrosome contains enzymes that pierce the membranes of the egg, in fertilization. Centrioles migrate to the region immediately after the nucleus of the spermatid and participate in flagella formation, the structure responsible for the movement of sperm.