Conquer the Kaplan Nursing Entrance 2026 – Prep, Practice, and Prosper!

A complete sentence is defined as a group of words that expresses a complete thought and contains at least a subject and a verb. In the given options, the selection that stands out is "The dog barked loudly." This sentence contains a clear subject ("the dog") and a verb ("barked"), along with an adverb that describes how the action is performed ("loudly").

The other options provided are dependent clauses or fragments; they introduce ideas but do not express complete thoughts on their own. For instance, "Since it was raining," "When I finish this assignment," and "Because I love reading" all rely on additional information to form complete sentences. They leave the reader expecting more to complete their thought, which is why they do not qualify as complete sentences. Thus, "The dog barked loudly" is the only complete sentence in this context.