Final answer:
The epididymis is where sperm gains motility and is stored, while the vas deferens carries the sperm and forms the ejaculatory duct.
Step-by-step explanation:
The correct answer is A) Epididymis, vas deferens.
The epididymis is the structure where sperm gains motility and is stored posterior in the tail. It is located along the top and posterior portion of the testes. The sperm leave the epididymis and enter the vas deferens, which carries the sperm behind the bladder and forms the ejaculatory duct with the duct from the seminal vesicles.