A complete unit of talk, bounded by the speaker's silence.

• A. Utterance
• B. Phone
• C. Allophone
• D. Coordinating Conjunction

Answer: (A)

In linguistics, a complete stretch of speech produced by one person from the moment they begin until they pause or stop is called an utterance. It marks the boundary of the speaker’s turn and can range from a single word to a full sentence, defined by the moment of silence or a deliberate pause. A phone is a concrete speech sound, an allophone is a surface variant of a phoneme, and a coordinating conjunction is a word like and or but that links parts of a sentence. These describe sounds or grammatical connectors, not the bounded unit of talk itself. So the term that fits the definition is utterance.