Which of the following correctly describes a compound sentence?

A compound sentence is correctly described as a sentence with more than one subject or predicate. This means that a compound sentence consists of at least two independent clauses that are usually connected by a coordinating conjunction (such as "and," "but," or "or"). Each independent clause in a compound sentence can stand alone as a separate sentence, but they are combined to express related thoughts or ideas.

The other options do not appropriately define a compound sentence. One clause with a single subject and predicate pertains to a simple sentence, while a sentence that includes one independent clause and dependent clauses describes a complex sentence rather than a compound one. Additionally, the notion that a sentence where the subject performs the action describes a grammatical structure but does not specifically define a compound sentence format. Understanding these distinctions helps clarify what constitutes complex sentence structures in English grammar.