Which is the best definition of simile?

A.
a figure of speech that compares two unlike things using like or as; for example, "Nancy's cheeks are as red as roses"

B.
a figure of speech that gives human traits or characteristics to non-human objects; for example, "the wind laughed"

C.
a figure of speech in which a word or phrase is spelled the same forward and backward; for example, "a man, a plan, a canal, Panama"

D.
a figure of speech that uses one part of something to represent the whole thing; for example, "the footsteps followed her"