Homologous body structures are structures which a: have same structure different function
b: same function different structure
c: Structures which have not useful function

A is the correct answer

Explanation:

These structures may or may not have the same function

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.

gold i'm pretty sure i might be wrong