The correct option is C Gonad
Sexual reproduction in animals involves the production and fusion of two types of gametessperm and eggs. Typically, two different individuals are required because the gametes are produced in two different gonads. A male parent contributes sperm, and a female parent contributes an egg, or ovum (plural,ova). The sperm provides genes coding for some of the male parentstraits, and the egg contributes genes coding for some of the female parents traits. The egg is typically large and nonmotile, with a store of nutrients that supports the development of the embryo. The sperm is usually small and motile and adapted to propel itself by beating its long, whip like flagellum. When sperm and egg unite, a zygote, or fertilized egg, is produced. The zygote develops into a new animal, similar to both parents but not identical to either.