Final answer:
Mature spermatozoa enter the lumen of seminiferous tubules after a spermatogonium completes cell division and undergoes spermiogenesis.
Step-by-step explanation:
The correct answer is D) Mature spermatozoa enter the lumen. Spermatogenesis is the process of sperm production that occurs in the seminiferous tubules. After a spermatogonium completes cell division and undergoes meiosis, it becomes a spermatid. Spermatids then undergo spermiogenesis, a process of maturation where they develop into fully functional spermatozoa. These mature spermatozoa will eventually enter the lumen of the seminiferous tubules and be released during ejaculation.