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B
Chorion
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C
Allantois
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D
All
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Solution
The correct option is C Allantois The amnion is a membranous sac which surrounds and protects the embryo. It is the first of the three cavities in the embryo.
The chorion is a bilayered membrane, consisting of an outer layer of extraembryonic ectoderm (trophectoderm) and an inner epiblast-derived extraembryonic mesoderm.
The allantois, which serves as a reservoir for fetal urine in other mammals, becomes attached to the urinary bladder. The proximal part of the allantois (called the urachus) is continuous with the embryonic urinary bladder.