Question

A reader can usually recognize a sentence fragment because the reader is

Answer 1

The answer i got was A)

Answer 2

A reader can usually recognize a sentence fragment because the reader is A. left asking questions.
A sentence fragment, as the name itself says, is incomplete - it has to be included into a larger sentence in order to make sense. For example: 'when he sleeps' is a fragment because we don't know what happens when he sleeps - there is no enough information.