C. (3rd) Sperm and egg cells are made during meiosis.
Explanation:
Sperm and egg cells have as many chromosomes as any other kind of cell. -> No. Because sperm and egg cells are haploid while other types of cells are diploid.
Sperm and egg cells are made during mitosis. -> No. Sperm and egg cells are made during meiosis; mitosis isn't correct because it would produce new diploid (46) cells while sperm and egg cells are 23 (haploid). [If that wasn't the case people wouldn't have children because they would have 92 chromosomes instead of 46)].
Sperm and egg cells are about the same size. -> No. Sperm cells are a lot smaller that egg cells.
