Read the excerpt below from "Blow, Blow Thou Winter Wind" and answer the question that follows. Blow, blow, thou winter wind

Thou art not so unkind

As man's ingratitude;

Thy tooth is not so keen,

Because thou art not seen,

Although thy breath be rude.
In the poem, the comparison of the wind to man's character is .

an allusion
an extended metaphor
an inference
a motif