4) Robert B. Parker is a popular writer of detective novels, most of his books are about a private eye. 10 Points
O Run-on
Fragment
O Complete

Run-on sentence

Explanation:

A run-on sentence is a type of sentence that consists of two or more incorrectly connected independent clauses. When these clauses are simply put together with no punctuation mark or conjunctions, we get a fused sentence. When they are connected by a comma without a coordinating conjunction, we get a comma splice.

The given sentence is an example of a comma splice. It consists of two independent clauses:

They are connected just by a comma, which is incorrect. This can be corrected by adding a coordinating conjunction after the comma, turning the comma into a semicolon, or splitting these clauses into two sentences.