Final answer:
The sentence that uses the word 'whereas' incorrectly is option C.
Step-by-step explanation:
The sentence that uses the underlined academic vocabulary word incorrectly is option C. The word 'whereas' is used to indicate a contrasting element between two parts of a sentence. In this case, the sentence 'Whereas we all wanted to go to the art exhibit together' does not provide a contrasting element nor does it compare two parts of the sentence. Therefore, it is an incorrect usage of the word 'whereas'.
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