The correct option is
C Epididymis
In mammals, sperm cells are produced in the seminiferous tubules of each testis. These sperm cells leave the testes and pass into a larger coiled tube known as the epididymis. The sperm cells attain maturity in the epididymis. The sperm cells are stored in this structure till they are ejaculated. During ejaculation, the sperms pass from the epididymis into the vas deferens and are ejaculated with the semen through the penis.
Thus, the correct answer is option C.