The correct option is C Cuboidal epithelium
Germinal epithelium of ovary is formed of cuboidal epithelium. Simple cuboidal epithelium commonly differentiates to form the secretory and duct portions of glands. They also constitute the germinal epithelium which covers the ovary and the internal walls of the seminiferous tubules in the male testes. These cells offer some protection and function in absorption and secretion. So, the correct answer is option C.