Areader can usually recognize a sentence fragment because the reader is
a. left asking questions.
b. confused by too many words.
c. not sure where details apply.
d. puzzled where to stop reading.

The correct option is A.

A sentence fragment usually come in form of dependent clause or phrases, which do not express complete thoughts. This is because they lack one or two of the ingredients that make up a complete sentence. For instance a sentence fragment usually lack a subject or a predicate. Because sentence fragments express incomplete thoughts, they usually generate questions in the minds of the readers. An example of a sentence fragment is given below:

To come first.

often a noun phrase is just a noun or a pronoun:

people like to have money.

i am tired.

it is getting late.

is this multiple choice?