As it is presented in the passage, the approach to history taken by mainstream U.S. historians of the late nineteenth...

Hello, I am confused about why C is not also a correct answer? So rule one states that "if mushrooms are added third, then the lentils are added last." The third question in this game then tells us "if lentils are added last, then which of the following must be true?" Wouldn't it be the case that if lentils are last, then mushrooms must have been added third, making C the correct "must be true" answer? I know this may seem like a reversal of the S/N statement, but I'm pretty sure we used this method to determine the correct sequence for the game before this one. Thanks!