Final answer:
The primary follicle develops from the primordial follicle, which includes the activation and proliferation of granulosa cells.
Step-by-step explanation:
The primary follicle develops from the C) primordial follicle. Primordial follicles consist of a single oocyte and a single layer of flat (squamous) granulosa cells. With the onset of puberty, primordial follicles receive a recruitment signal, prompting their transformation into primary follicles. The granulosa cells of the primordial follicle then become active, transitioning from a squamous to a cuboidal shape and proliferate, marking the development of the primary follicle. As folliculogenesis proceeds, these primary follicles further develop into secondary follicles, which then may progress to tertiary follicles under the influence of FSH and other hormonal factors.