Answer:
The correct answer is "compound sentence"
Step-by-step explanation:
A compound sentence is formed by two independant clauses that are related but they can stand on their own. They are joined by a coordinating conjunction (and, or, but) that is placed after a comma.
In the example provided, the two independant clauses are "lightning lit the sky" and "the thunder crushed". These sentences are linked by the coordinating conjunction "and" with a comma before it.
The rest of the options are incorrect since a complex sentence is formed by an independant clause and a subordinate clause.
A simple sentence is an independant clause that can stand on its own with no subordinate or coordinate clause.
A run-on sentence takes place when joining two independant clauses incorrectly.