Read the last stanza of "mutability.”

it is the same! —for, be it joy or sorrow,
the path of its departure still is free:
man’s yesterday may ne’er be like his morrow;
nought may endure but mutability.

which of shelley’s ideas from "a defence of poetry,” is most reflected in this stanza?

poetry is an expression of the imagination.
poetry can make all things more beautiful.
life is fleeting and constantly changing.
life is filled with a wide range of emotions.