Correct Answer:
D. None of these
The correct answer is None of these because a compound sentence is structurally defined by having at least two independent clauses, rendering the other individual grammatical choices incorrect.
- None of these: This is the correct choice. By standard rules of English syntax, a compound sentence must consist of two or more independent clauses joined by a coordinating conjunction (such as the FANBOYS: *for, and, nor, but, or, yet, so*) or a semicolon. Because none of the single criteria in options 1, 2, or 3 accurately define its mandatory baseline components, 'None of these' is the only structurally sound answer.
- Incorrect Options:
- One verb: This is incorrect. A compound sentence is formed by multiple independent clauses, meaning it must feature at least two separate main verbs (one for each individual clause) to establish the distinct predications.
- A subordinate clause: This is incorrect. A subordinate clause—also known as a dependent clause—is a mandatory component of a complex or compound-complex sentence, whereas a pure compound sentence cannot contain any subordinate clauses.
- A dependent clause: This is incorrect. This is simply another linguistic term for a subordinate clause; its presence completely alters the sentence structure away from being classified as a pure compound sentence.