Concept:The epididymis is the structure where sperms are stored after being produced in the testes.Explanation:In the human male reproductive system, sperms are produced in the testes.They then pass into and are temporarily stored in the epididymis before ejaculation.The prostate gland and seminal vesicles produce fluids, not store sperms.The sperm duct transports sperms during ejaculation.Answer:A. epididymis.