The general clause is “because we were out of milk” :)
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.
We D) sped to work, because we were running late.
