This problem can best be described as a number line problem, where you would mentally line up all the students in order of increasing height and ask yourself how many students are shorter if Stacey is the 12th tallest? The answer would be 11 students. Now ask yourself how many students are taller if Stacey is the 12th shortest? The answer would again be 11 students. Since there are 22 students in the class besides Stacey, there must be 23 students altogether, or choice B.