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What characteristic defines a clause in a sentence?

  1. A group of words lacking meaning

  2. A statement that is not independently useful

  3. A grammatical unit containing a subject and a verb

  4. A non-essential part of a sentence

The correct answer is: A grammatical unit containing a subject and a verb

A clause is defined as a grammatical unit that contains both a subject and a verb. This fundamental structure allows a clause to convey complete ideas or actions, serving as a building block for sentences. Clauses can be independent, standing alone as complete thoughts, or dependent, needing additional information to form a complete sentence. The other choices highlight attributes that do not align with the essential nature of what constitutes a clause. Some speak to elements that might describe fragments or phrases that do not convey a complete thought or lack functional components in terms of sentence structure. These misconceptions clarify why the focus on the subject-verb pairing in option C accurately captures the core definition of a clause in grammatical terms.