What spelling mistake is found in the sentence about Frank?

The spelling mistake in the sentence about Frank is the word "couragous." This word is incorrectly spelled, as the correct form is "courageous." The term "courageous" is an adjective that describes someone who shows bravery or is willing to face challenges despite fear. The letters 'o' and 'u' need to be placed together before the letters 'a' and 'g' to accurately represent the correct spelling.

In contrast, the words "firefighter" and "lives" are correctly spelled. "Firefighter" is a compound word that describes a person whose job is to extinguish fires, while "lives" is the plural form of "life" or a verb form that indicates the act of living. The option "courageous" is indeed the correct spelling, which emphasizes that "couragous" is the only misspelled term in the list.