Final answer:
The granulosa cells of developing follicles secrete estradiol, a type of estrogen. Hence the correct answer is option A
Step-by-step explanation:
The granulosa cells of developing follicles secrete estradiol. This hormone is a type of estrogen and is produced by the granulosa cells of the tertiary follicles in the ovaries in response to LH stimulation. Estradiol plays a critical role in the follicular phase of the ovarian cycle and is important for the growth and development of the follicles.
Hence the correct answer is option A