Question

read these lines from \sonnet 18\ by william shakespeare. and every fair from fair sometime declines, by chance, or natures changing course untrimmd the purpose of these lines is to explain that beauty can fade teach a lesson about nature define the meaning of \fair\ argue that things never change

Explanation:

The lines from "Sonnet 18" state that every fair (beauty) will decline at some point, either by chance or due to nature's untrimmed (uncontrolled) changing course. So the purpose is to explain that beauty can fade. The other options: teaching a lesson about nature is not the main point, defining "fair" is not done here, and arguing things never change is opposite to the lines' meaning.

Answer:

explain that beauty can fade