Which of the following describes a simple sentence?

A sentence that contains at least two independent clauses, and at least has one dependent clause
A sentence that contains one independent clause, and at least one dependent clause
A sentence that contains a subject and a verb in expresses a complete thought
A sentence that contains two or more independent clauses that are usually join with the comma and a conjunction

A sentence that contains a subject and a verb and expresses a complete thought describes a simple sentence.

The correct answer is: A sentence that contains a subject and a verb and expresses a complete thought.