The correct option is A Spermiogenesis
Production
of sperms from spermatids is spermiogenesis. It is the last stage of
spermatogenesis. It occurs in testis and begins at puberty. The spermatids are transformed
into sperms by the process of metamorphosis. Sperms are also known as
spermatozoa. After spermiogenesis, the sperm heads become embedded in the
Sertoli cells, and are finally released from the seminiferous tubules by the
process called spermiation.