The correct option is
B Both B and C
The ovarian cortex contain a large mass of yellow cells, termed corpus luteum, formed in the cavity of an empty graffian follicle after the release of its ovum.
The cells of the corpus luteum contain a yellow pigment called lutein and secrete the hormone progesterone and a small amount of estrogen during pregnancy and the hormone relaxin toward the end of pregnancy.
So, the correct answer is 'Both B and C'.