Read these lines of poetry:

An empty chair underneath a torn-up piece of paper—

My sadness spreads as smooth and soft as a vapor.

Through the window and under the door,

It covers the walls and coats the floor.

Which line contains a simile?

A"It covers the walls and coats the floor."

B"My sadness spreads as smooth and soft as a vapor."

C"Through the window and under the door,"

D"An empty chair underneath a torn-up piece of paper—"