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.

to and without are prepositions, so a, b, and d are prepositional phrases. the adverb phrase is c, about the surprise.

explanation:

the economic activity signified in that scenario is a. production

in general, market production makes reference to the elaboration of a product or service which is destinated for economic purposes (to be sold) at money-price in a market. such product or service has to be principally tradable for money.

there is no money exchange involved in distribution, generalized reciprocity or balanced reciprocity.