The correct option is C Follicle stimulating
Development of oogonia into mature follicles is stimulated by production of follicle stimulating hormone (FSH) by the pituitary gland. This in turn is stimulated by the release of gonadotropin releasing hormones (GnRH) by the hypothalamus. In females, FSH initiates follicular growth, specifically affecting granulosa cells. This hormone also seems to be critical in selecting only the most advanced follicle to proceed to ovulation. FSH stimulates the ovarian follicle, causing an egg to grow. The shift to LH causes the egg to be released from the ovary by the process called ovulation.