Answer:
The correct option is identical.
Step-by-step explanation:
A modifier refers to a word, phrase, or clause which can work either as an adjective or as an adverb whose main function is to provide a description. These modifiers have comparative and superlative forms that are used to compare two things.
Such comparison is commonly defined as the act of evaluating two or more things (person, place, thing or even an idea) in order to determine if such ideas are similar or different.
Bearing in mind the described above, it could be said that the word identical could be used as a modifier to make a comparison.