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B
Amniotic cavity
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C
Pleural cavity
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D
Allantois
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Solution
The correct option is B Amniotic cavity The amnion is a bilayered membranous sac which surrounds and protects the embryo, enclosing the amniotic cavity (amnion). It is the first among the three embryonic cavities (amnion, chorion and yolk sac) to develop.