The human body includes both asexual reproduction and sexual reproductions. The asexual reproduction is similar to mitosis, in which somatic cells are going to get divide into two similar daughter cells.
The sexual reproduction is due t meiosis of male and female germ cells into male & female gametes in humans. This is because of presence of complex life cycles including sexual reproduction in humans to generate offspring. The high metabolic rates and physiological activities are other complex strategies.
Thus, the options (a), (c) and (d) are incorrect.
Cell is the basic structural unit of the body. The human body cells include both asexual reproduction and sexual reproductions.
Therefore, the correct option is – b. sexual reproduction and asexual reproduction.