The correct option is C Collateral gland
Male reproductive system of rabbit has following components : testes, epididymis, vasa deferentia, urethra, penis.
Accessory sex glands (seminal vesicles, prostate gland, Cowper's gland, perineal gland, rectal gland bulbourethral gland). Whereas collateral glands are present in cockroach which forms egg case.
Thus, the correct answer is option B.