Identify the run on sentence.
- A. The lecture ended early; the students left.
- B. The lecture ended early, the students left.
- C. The lecture ended early, so the students left.
- D. Because the lecture ended early, the students left.
Explanation
Two independent clauses joined by nothing more than a comma form a comma splice, which is a type of run on. It is repaired with a semicolon, with a coordinating conjunction after the comma, or by subordinating one clause, all three of which appear as the other options. A full stop would also work.