The correct answer is: D. All of these.
Estrogen, progesterone, and relaxin are all female reproductive hormones. Estrogen is responsible for the development of female secondary sexual characteristics, such as breasts and hips. Progesterone prepares the uterus for pregnancy and helps to maintain pregnancy. Relaxin helps to soften the cervix and ligaments in the pelvis during labor.
Estrogen is a steroid hormone that is produced primarily in the ovaries. It is also produced in small amounts by the adrenal glands and the placenta during pregnancy. Estrogen is responsible for the development of female secondary sexual characteristics, such as breasts and hips. It also plays a role in the menstrual cycle, pregnancy, and menopause.
Progesterone is a steroid hormone that is produced primarily in the ovaries. It is also produced in small amounts by the adrenal glands. Progesterone prepares the uterus for pregnancy and helps to maintain pregnancy. It also plays a role in the menstrual cycle and menopause.
Relaxin is a hormone that is produced primarily in the placenta during pregnancy. It also produced in small amounts by the ovaries and the uterus. Relaxin helps to soften the cervix and ligaments in the pelvis during labor. It also helps to widen the pelvis and make it easier for the baby to pass through.
All of these hormones are essential for female reproductive health.