Which sentence forms a complete sentence?

• A. The last cow in the field?
• B. They're here—the small, the medium and the large.
• C. Again with the chicken!
• D. Big, snarly animals in the cage.

Answer: (B)

A complete sentence has a subject and a predicate with a finite verb, forming a full thought. In the given line, the subject They is paired with the finite verb are (contracted as They’re), making a clear assertion about their presence: They’re here. The dash simply adds a descriptive list, but the core subject and verb are still there, so it expresses a complete idea.

The other lines don’t meet that requirement. They’re missing a finite verb or are just noun phrases, like a label or fragment rather than a full statement. They don’t present a complete thought with both a subject and a proper predicate, so they’re not complete sentences.