The correct option is D Cowper's glands
The male reproductive organs in Rabbits include a pair of testes, a pair of epididymes, a pair of vasa deferentia, urethra, penis and some accessory glands- prostrate gland, cowper gland, perineal gland and rectal gland. These sex glands open into the urethra pf the male and the secretions from these glands together with those of epididymes and uterus masculinus, constitute the seminal fluid or semen. The Cowper's gland lie in pair posterior to the prostrate glands and dorsally at the base of the penis. The secretion of this accessory gland neutralizes acidity for the protection of spermatozoa.