Correct answer: A) It isn’t necessary to vital signs
The main function of the male reproductive system is to produce, transport and maintain the sperm. It is responsible for the production of the male sex hormone, which is responsible for maintaining the male reproductive system.
The testes in the male are responsible for the production of testosterone, the sex hormone, which necessary to produce sperm. Sperm is produced inside a coiled like structure called as seminiferous tubule.
Hence, the correct answer would be option A.