Which of the following statements is an example of a metaphor?
A. The horse hooves of rain landed loudly on the tin roof.
B. Her voice was like a thick velvet blanket.
C. The trees swayed gently as nature's dancers.
D. The dog ran straight into the patch of wet cement.
Metaphors are comparisons without the words "like" or "as". Since both B and C use "like" and "as", and answer choice D does not compare anything, the answer is A.