A2. From the net on the right, we form a cube. Which letter is written on the face that lies opposite the face on which the letter S is written?
(A) K
(B) $\mathrm{U}$
(C) $\mathrm{M}$
(D) I
(E) $\mathrm{O}$

![](https://cdn.mathpix.com/cropped/2024_06_07_1ce1e4422095ce2d7960g-2.jpg?height=226&width=288&top_left_y=915&top_left_x=1541)
A2 The face with the letter $\mathrm{M}$ is the only face in the cube's net that cannot share an edge or a vertex with the face with the letter S, so the faces are opposite.