Question

how does adding the affix -etic to the words energy, athlete, and poet change the meanings of these words?
it changes them from nouns to adjectives.
it changes them from adjectives to nouns.
it changes them from nouns to adverbs.
it changes them from adverbs to nouns.

Explanation:

The words "energy", "athlete", and "poet" are nouns. Adding the -etic suffix makes words like "energetic", "athletic", "poetic", which are adjectives. Suffix -etic is often used to form adjectives from nouns.

Answer:

It changes them from nouns to adjectives.