What is the main function of the human reproductive system?

The main function of the reproductive system is ;  Reproduction of offspring's

The reproductive system has several functions which includes producing gametes, secretion of hormones like estrogen, nurturing a fetus until it matures into an offspring and given birth to. and also breast-feeding the offspring.

The summary of all the functions of the reproductive system leads to the main function of the reproductive system which is reproducing offspring and maintaining the existence of a specie.  

Hence we can conclude that the main function of the reproductive system is the Reproduction of offspring's

Learn more :

For the survival of any species

Explanation:

The main function of reproductive system with in any species to ensure the survival and pro-logitivity of that particular species by reproducing offspring. All other systems with in the body work to ensure proper functioning of the body and maintain its health. The species whose rate of reproduction is slow usually face the challenge of pertaining their existence for a long time. Whenever the death rate become higher than the birth rate within the population of any species, the population of that particular species starts deteriorating.  Hence, reproductive system must be effective to allow an species produce offspring.

the answer is d. chordata