At the Beginning of the Luteal Phase,progesterone Levels Rise and Then

At the beginning of the luteal phase,progesterone levels rise and then decrease sharply at the end of this phase.What causes this increase then decrease in hormones during this phase?

A) At the beginning of the luteal phase,the follicle turns into the corpus luteum which manufactures progesterone.At the end of the phase,this mass degenerates.
B) Leftover progesterone from the previous phase keeps levels high at the beginning of the luteal phase.These levels slowly dissipate by the end of the phase.
C) At the beginning of the luteal phase,the corpus luteum stimulates progesterone production by the ovaries.The high levels of progesterone cause the negative feedback system to readjust the levels.
D) The shedding of the endometrium at the beginning of the luteal phase creates an imbalance of hormones,including progesterone.As the endometrium is regenerated,progesterone levels return to normal.