The answer is B. meiosis.
All cells in an organism are diploid (2n). Only reproductive cells are haploid cells (n). Mitosis is a division of a cell into two daughter cells identical to the mother cell. Meiosis is a cell division during which the number of chromosomes is reduced by half (from 2n to n). So, reproductive cells (n) are created by meiosis.
Cytokinesis is the phase during mitosis and meiosis.
