The correct option is D the combination of seminal plasma and sperms
The seminal plasma along with the sperms constitute the semen which is a whitish alkaline fluid.
Seminal plasma is a combination of secretions from all the accessory glands. It includes secretions from seminal vesicles, prostate gland and also from bulbourethral glands.
Sperms produced in the testis are transported through the accessory ducts. The secretions of accessory glands are released into the accessory ducts. Sperms get mixed with the seminal plasma in the accessory ducts to form semen.