Directions: Each item consists of a sentence with an underlined word followed by four words. Select the word that is opposite in meaning to the underlined word. Our professor was perplexed by the answers we wrote in the examination.

Step-by-step solution

The word 'perplexed' means completely baffled, very puzzled, or confused. The word 'enlightened' means having or showing a rational, modern, and well-informed outlook, or being provided with clarity and understanding. Therefore, 'enlightened' is the exact opposite of 'perplexed'. The words 'confused' and 'befuddled' are synonyms of 'perplexed'. Answer: enlightened