Answer:
b. Adjectives
Explanation:
In this case, “this” and “that” would be adjectives because they are adding clarity to the nouns.
For example, “this cat”. In that instance, “this” is not functioning as a noun, it is instead specifying which cat the speaker is referring to. You can take “this” or “that” and have it modify any noun, and it would still be an adjective.
In this sentence the word <em>sage</em> means wise or sensible, a piece of advice given by someone who knows about the subject.
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