Question

where does menstrual blood leave the body? ovum vagina endometrium uterus

Explanation:

During menstruation, the lining of the uterus (endometrium) is shed along with blood. This menstrual flow (blood and tissue) exits the body through the vagina. The ovum is an egg cell, the endometrium is the uterine lining that is shed, and the uterus is where the lining is shed from, but the exit point for the blood is the vagina.

Answer:

B. Vagina