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Which of the following is a sentence fragment?

AChecking his mail each day was always fun.
BHiding in the tree fort he had built as a kid.
CRealizing you are getting older is sobering.
DKnowing he would be late, she took a nap.

Verified Answer :

The correct answer is B. Hiding in the tree fort he had built as a kid. 

This is a sentence fragment because on its own it has almost no meaning and requires clauses to be added in order to fully convey meaning.