Answer:
Adjective is the correct answer.
Explanation:
As a part of the speech, an adjective can be understood as a word or phrase that names and attribute, added to or grammatically related to a noun (which in this case is the flower) and used to describe or modify this noun. In this case, the noun is flower, the verb is seems, there is no adverb, and the the adjective that modifies the noun is missing.
