You don't need any gimmicks to answer the quiz, just an understanding of the word "gimmick." Sentence B does not use "gimmick" correctly. Gabi is making a "grimace," a twisting of the face or features, at the foul-smelling meat. You can also disregard C, since it uses "gimmick" as a verb instead of a noun. It's the ability to "imitate" or "mimic" the songs of other birds that distinguishes the mockingbird. And Sentence D refers to "giblets," the edible inner organs of a bird. That leaves Sentence A with the salesman's pitch as the correct one.