Question

Which of the following is a sentence fragment?

A.) Realizing you are getting older is sobering.
B.) Hiding in the tree fort he had built as a kid.
C.) Knowing she would be late, she took a nap.
D.) Checking his mail each day was always fun.

Answer 1

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

Answer 2

The answer is B because who built it