Answer:
The blue boat.
Step-by-step explanation:
An adjective is a part of speech in grammar that describes or modifies a noun. It adds detail about a noun or pronoun in the sentence.
Among the given options, "the blue coat" contains an adjective. This is because the noun "coat" is described as "blue", which is an adjective. The other options contain no adjective in them.
The (article) blue (adjective) coat (noun).
Thus, the correct answer is the first option.