The correct option is C C, G and F
Semen is an organic fluid, that usually contains spermatozoa. It is secreted by the sexual glands in males.
The following structures are involved in semen production:
Structure marked C is testes, which produces 2 - 5% of semen released per ejaculation.
Structure marked G is seminal vesicle, which produces 65 - 75% of semen in the form of amino acids, citrate, enzymes, fructose, prostaglandins, proteins, and vitamin C.
Structure marked F is prostate gland, which produces 25 - 30% of semen in the form of acid phosphatase, citric acid, prostate specific antigen, proteolytic enzymes.
Hence, the correct answer is option C.