Which of the following best describes a compound-complex sentence?

A compound-complex sentence is defined by its structure, which consists of at least two independent clauses along with at least one subordinate clause. Independent clauses are complete thoughts that can stand alone as sentences, while subordinate clauses provide additional information but cannot stand alone. This combination allows for more complex ideas to be expressed within a single sentence.

The presence of multiple independent clauses contributes to the sentence's compound nature, while the subordinate clause adds complexity, connecting related ideas in a cohesive way. The structure enables the writer to convey intricate relationships between different thoughts effectively.

The other options do not accurately capture the definition of a compound-complex sentence. For instance, a single independent clause characterizes a simple sentence, while multiple subordinate clauses or just two independent clauses linked by a conjunction do not fulfill the requirement of having at least one subordinate clause, which is essential for identifying a compound-complex sentence. Hence, the correct choice encapsulates the essential components that define a compound-complex sentence.