An embryo develops in the

A. Uterus
B. Cervix
C. Ovary
D. Vagina

The correct choice is A.

After the first days of the baby's development in its zygote stage, it remains in the mother's uterus as an embryo. It will remain in the uterus until it is born.

A. uterus

Explanation:

There are a few stages of embryo development:

1. Fertilization: this is where the female gamete (egg) meets with the male gamete (sperm) and they form a zygote

2. Blastocyst development: this is where the zygote divides into a ball of cells that eventually becomes the embryo inside a structure called the blastocyst; the blastocyst then travels up to the uterus.

3. Embryo development: this is where the embryo truly starts to develop in the uterus, growing the crucial body parts