The correct answer is C. The quick-thinking, well-dressed speaker shocked the audience
Step-by-step explanation:
Hyphens (-) are punctuation signs used to join words or parts of them, mainly to indicate the meaning of the two words will be combined, the most common use of hyphens occurs in adjectives in which two or more words are combined to show the features of one noun as in the case of "well-dressed" (combination of two adjectives) to describe the speaker; but also nouns can be combined with adjectives, in this case, the adjective should always come before the noun as in the case of "quick-thining" which is a combination of an adjective "quick" and a noun (thinking). Thus, the sentence that shows the correct use of the hyphen is "The quick-thinking, well-dressed speaker shocked the audience".