Answer:
It is shed from the uterus during menstruation.
Step-by-step explanation:
First of all, we need to talk about ovulation process. It happens once in a menstrual cycle, it refers to the release of an egg, due to hormones changes, which are called oestrogen. This way, the eggs produced are inside the ovaries, and they are continually growing during the first stages of menstruation, when they are ready to be fertilized, it must happen during the next 24 hours, otherwise, eggs are gonna be discarded, and the menstruation cycle starts again. So, during this 24 hours window pregnancy could happen or not. That's why the correct option is "It is shed from the uterus during menstruation".