Final answer:
Option B is the complete sentence because it has a subject, verb, and expresses a complete thought, unlike Option A, which is a run-on sentence.
Step-by-step explanation:
The question asks to identify which option is a complete sentence. A complete sentence must have at least a subject and a verb and express a complete thought. Option A, 'Lexi wept during the movie it had an emotional ending,' is a.run-on sentence because it lacks proper punctuation to separate two independent clauses.
A complete sentence is a sentence that contains a subject and a predicate and expresses a complete thought. According to the options given, the only sentence that is a complete sentence is option B: "Gavin and Maria both handle themselves well under pressure." It includes a subject (Gavin and Maria) and a predicate (handle themselves well under pressure) and expresses a complete thought.
Option B, 'Gavin and Maria both handle themselves well under pressure.' is a complete sentence as it has both a subject (Gavin and Maria) and a verb (handle) and it expresses a complete thought.