The Opposition

"The answer is 'A,'" I say, keeping my voice light and kind. Carter snorts from beside me. "No, it's 'C.'" Bingo. I was hoping he'd say that. "The question clearly asks you to round to the nearest tenth. If I'm not mistaken, which I don't believe I am, answer 'C' has two decimal places." I smirk as his mouth twitches...