The correct option is D Female reproductive tract
Sperms produced in the testis reach penis via various accessory ducts such as rete testis, epididymis, vas deferens, etc.
The release of sperms from the penis into the vagina of a female is called insemination.
Once sperms are released, the capacitation of sperms occurs in the female reproductive tract.
During capacitation, the medium inside the uterus wears off the coating substances of the sperm head. This exposes the receptor sites on the acrosome of sperm making it penetrate the egg.
Capacitation involves the processes that cause sperm activation.