The correct option is A In vitro fertilization
In human beings, fertilization carried outside the body is called in vitro fertilization. In some females, due to some problem, fertilization cannot take place. In such cases, freshly released egg and sperms are kept together for few hours for fertilization to occur outside the body. After fertilization, the zygote is allowed to develop for about a week and then it is placed in the mother’s uterus. Complete development takes place in the uterus and the baby is born like any other baby. Babies born through this technique are called test-tube babies.