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—"