emergency of the plumule out of the ground
provision of nourishment by the endosperm
elongation of the hypocotyl
elongation of the epicotyl
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Answer: C. elongation of the hypocotyl 
Explanation:
The confusion often comes from mixing up hypogeal and epigeal germination:
In hypogeal germination, the cotyledons remain underground, and it is the hypocotyl (the stem below the cotyledons) that elongates to push the plumule above the soil.
In epigeal germination, the cotyledons are lifted above the ground, and the epicotyl elongates.
So, MySchool says
D. elongation of the epicotyl, that is actually describing epigeal germination, not hypogeal.
Correct structural marker of hypogeal germination is C. elongation of the hypocotyl
