Final answer:
Option (b), Sexual reproduction involves the process of meiosis to produce haploid gametes, followed by the fertilization step where two gametes merge to form a diploid zygote.
Step-by-step explanation:
Sexual reproduction requires the cellular process of meiosis followed by fertilization. Meiosis is the type of cell division that results in four haploid daughter cells, which then can develop into mature gametes through the process of gametogenesis. In humans, this includes spermatogenesis and oogenesis.
The subsequent step in sexual reproduction is fertilization, where a haploid sperm cell and a haploid egg cell unite, resulting in the formation of a diploid zygote. This zygote ultimately develops into a new individual, thus ensuring the continuation of the species.