Which of the following statements is true of meiosis? a. it divides one haploid cell into four diploid cells. b. it divides one haploid cell into two diploid cells. c. it divides one diploid cell into two haploid cells. d. it divides one diploid cell into four haploid cells.

The answer is D. It divides one diploid cell into four haploid cells. 
During the meiosis process the chromosomes o the parents will be reduced by half and produce them into four  gamete cells.
This process is really necessary for the production of sperm and egg cells needed in sexual reproduction