In North America, I have photographed cactus plants from Mexico to Canada, and I think Arizona cacti are the most beautiful.
Which capitalized word is used as an adjective?

Answer :

Answer:

Arizona

Explanation:

I would say that North America is one word together, so "North" is not working as an adjective.

Mexico and Canada are working as nouns, not adjectives.

Arizona is working as an adjective to describe the kind of cacti the writer believes is the most beautiful.

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