Explanation:
The male reproductive system in cockroaches consist of a pair of testes, a pair of vas deferens, ejaculatory duct, seminal vesicle, mushroom glands, and external genitalia. Testes are present at 4th-6th segments while the mushroom gland is present in 6th -7th segments. The female reproductive system consists of a pair of ovaries, a pair of oviducts, a common oviduct i.e., vagina, genital chamber and external genitalia. The genital chamber shows the opening of spermathecae which is a storehouse of sperms. Ovaries extend from 2th - 6th segments and show many tubules known as ovarioles. Spermathecae is in the 6th segment.Hence, the correct option is (B).