The point is 1 in the upper left corner, 4 in the lower left corner, and press 3 in the lower right corner clockwise; If you press it counterclockwise, the lower left corner is 2 and the lower right corner is 3; The middle point is 5, and the number is the sum of the midpoint and the corner point; Clockwise calculation is 9×3=27, counterclockwise calculation is 7×3=2 1, and the reference option is C.