The correct option is C spermatogenesis
Testis is present outside the abdominal cavity within a pouch called scrotum in order to facilitate spermatogenesis.
Spermatogenesis is the process of production of sperms and it occurs in the seminiferous tubules of testis. The process of spermatogenesis requires a lower temperature than the body temperature to produce viable sperms.
Scrotum maintains 2-2.5 degrees Celsius lower temperature than the human body temperature to facilitate the production of sperms, i.e spermatogenesis.
Ejaculation is the process of discharge of semen.
Insemination is the transfer of sperms into the female genital tract.
Urination is the discharge of urine out of the body.