Since <em>ostentatious </em>and <em>modest </em>are antonyms, their meanings are completely opposite, we need to find a pair of words which also denote something different. The correct answer is reticent:talkative, because reticent is shy, and talkative is obviously not.
<em>Answer: </em><em>Option D,</em>
<em>He did not multiply the chlorine and oxygen atoms by the coefficient 4.</em>
<em>Explanation:</em>
<em>I took the quiz and got it right on edg, hope this helps! :)</em>
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The simple subject is an individual noun or noun substitute acting as subject.
Answer: Simple Subject