Which is the best definition of metaphor? a. an indirect comparison that uses the words like or as; for example, "you're as pretty as a picture" b. a direct comparison between two unlike things; for example, "my tongue is sandpaper" c. a comparison between two things that are closely related; for example, "gorillas are larger than chimpanzees" d. an unusual comparison that is meant to be funny; for example, "my uncle looks just like a sweet potato"