Three of the words will be in the same classification, the remaining one will not be. Your answer will be the one word that does NOT belong in the same classification as the others.
Answer: Option C
The wing, fin, and rudder are all parts of an airplane.
The noun, preposition, and adverb are classes of words that make up a sentence. Punctuation belongs in a sentence, but punctuation is not a class of word.
Answer: Option D
The cornea, retina, and pupil are all parts of the eye.
Answer: Option B
The couch, table, and chair are pieces of furniture; the rug is not.
A leopard, cougar, and lion all belong to the cat family; an elephant does not.