The cross is folded into a cube. Which of the points Q, R, S and T will touch point P?

P is the top-right corner of the top square. When that square folds down onto the top, its right edge lies along the top edge of the square to the right of the centre, so P lands on the far end of that edge, point Q. R and T come together at the other corner of the top square, and S meets the bottom corner of the right-hand square.