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B
32-celled stage
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C
Zygote only
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D
Embryo only upto 8-celled stage
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Solution
The correct option is B Zygote or embryo upto 8-celled stage In vitro fertilization is the fertilization outside the body in similar conditions as that in the body is the method in which sperm from the male and ovum from the female are collected and are induced to form zygote or early embryo with up to 8 blastomeres could then be transferred into a fallopian tube.
So the correct option is 'Zygote or embryo up to 8-celled stage'.