A) Fertilizing egg is removed from the body of the female and fertilized with the husband's sperm outside in vitro culture and then the zygote is transferred back to mother's uterus.
B) External fertilization and development in vitro culture till 32 cell stage before putting the embryo back into mother's uterus.
C) Complete development of a baby take place in vitro.
D) Development upto 32 cell stage of embryo takes place and its transplantation in the uterus of a surrogate mother occurs.
Correct Answer: B
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