Decorum in spoken English refers to propriety, appropriateness, and dignity of speech—primarily related to clarity and purity of style. It involves choosing language that fits the context, audience, and occasion with elegance and correctness of style. Gestures relate to body language, grammatical usage to grammar, and voice quality to phonation—none capture 'decorum' as fully as clarity and purity of style. Hence (2) is correct.
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