Each answer below contains an error. Select the example of the error known as a run-on sentence.

A. He went to the library. Because he wanted a book.

B. He went to the library he wanted a book.

C. Went to the library.

D. He went to the library. After he wanted a book.

A. The error is the use of 'because' in a separate sentence. The conjunction 'because' links two clauses within the same sentence. The correct sentence would be:

He went to the library because he wanted a book.

B. The error is the lack of a conjunction linking the two clauses, this is, a conjunction like 'because' is missing.

He went to the library because he wanted a book.

C, Went to the library is a case of run-on sentence because it has no subject.

The structure of this run-on sentence is: + + + +

D. The clause he went to the library expresses a consequence and he wanted a book expresses a cause, therefore the use of 'after,' expressing time, as a linking word is incorrect. Only conjunctions like 'because' or 'so' can be used in this case.

He went to the library because he wanted a book.

He wanted a book, so he went to the library.