The correct option is B Epididymis
Spermatogenesis initially takes place in the testes (seminiferous tubules) and progress to the epididymis where the sperms are stored until ejaculation. Spermatozoa acquire their fertilizing ability and forward motility during the epididymal transit. This process takes about 2-3 days in humans. Hence, the correct answer is 'Epididymis'.