Respuesta :
The word that cannot be modified to comparative or superlative form is B) rose, because that is a noun.
Only adjectives and adverbs have the quality of comparative and superlative, and A) C) and D) are all adjectives, while B) is not.
Only adjectives and adverbs have the quality of comparative and superlative, and A) C) and D) are all adjectives, while B) is not.
Actually the answer is A, Unique. I just took the test and got it right.