Final answer:
Spermatogenesis results in the formation of four haploid sperm cells, whereas oogenesis produces one mature ovum and additional non-functional polar bodies. Thus, spermatogenesis produces a larger number of cells.
Step-by-step explanation:
When comparing spermatogenesis and oogenesis, it's essential to look at both the process and the end results. Spermatogenesis is the male form of gametogenesis and occurs in the testes, resulting in the formation of four haploid sperm cells from a single germ cell through meiosis. On the other hand, oogenesis is the female form of gametogenesis and takes place in the ovaries. Unlike spermatogenesis, oogenesis produces one mature ovum and additional polar bodies that do not develop into eggs from a single germ cell, also through meiosis.
In conclusion, spermatogenesis produces a larger number of cells as a result compared to oogenesis. Therefore, the correct answer to the question is: a) Spermatogenesis.