Answer: D). Uterus
Explanation: Fertilization occurs in the fallopian tube. Fertilization is the fusion of a sperm and an egg to form a zygote. The zygote moves down the fallopian tube to the uterus where it gets embedded into the wall of the uterus. Its attachment to the uterine wall enables the embryo to develop. If the embryo fails to attach itself to the wall of the uterus, the pregnancy will be aborted.