Adjectives in this sentence the grand canyon is considered one of the natural wonders of the world

- Natural.

Explanation:

Adjectives are defined as the words that qualify or modifies noun or pronoun. The adjectives function to modify a noun or pronoun by offering more details about it that may include various aspects like size, color, quality, number, etc.

As per the question, the adjective employed in the given statement is 'natural' that qualifies/modifies the noun 'wonders'. It could have been 'grand' but 'The Grand Canyon' here together works as a proper noun in the sentence. Thus, 'natural' is the adjective in the sentence.

the answer is c) !