The graph below illustrates the concentrations of four hormones ($P$, $Q$, $R$, and $S$) in the blood plasma of a healthy adult female over a standard 28-day menstrual cycle.

Which row in the table correctly identifies the hormone that stimulates the repair and thickening of the endometrium (uterine lining) during the follicular phase, and the structure that secretes the hormone responsible for maintaining this lining during the luteal phase?

Choose from options A, B, C, or D.