The correct answer is Penis.
The male copulatory organ is Penis. It is an external genatlia in males, which used for the purpose of insemination that is deposition of the sperms into the female reproductive tract.
The sperms can fertilize the egg and produce zygote if they encounter an egg ( released by ovary) in the Fallopian tube.
On the contrary, testes are the male reproductive organs, which are present in the pouch of skin called scrotum and vas deferens are the ducts that transport sperms from epididymis to the ejaculatory duct of the reproductive system.