Read the first stanza from "Mutability." We are as clouds that veil the midnight moon; How restlessly they speed, and gleam, and quiver, Streaking the darkness radiantly!—yet soon Night closes round, and they are lost for ever How does Shelley convey the idea that humans are constantly moving and changing? by personifying the moon by comparing humans to clouds by personifying the night by comparing humans to darkness

Shelley conveys the idea that humans are constantly moving and changing:

B. by comparing humans to clouds.

Explanation:

We are as clouds that veil the midnight moon;

The very first line has the answer we need. Shelley is using a type of comparison here called simile. His purpose is to confer some of the attributes of the clouds to us humans by saying we are like each other. Humans also "speed, and gleam, and quiver," figuratively speaking. We are, like the clouds, in constant motion, ever changing. One day we also shall be gone, just like the clouds once the night closes round.

the answer is a hoped this