AMC 8 1989 Problem 20

The figure may be folded along the lines shown to form a number cube. Three number faces come together at each corner of the cube. What is the largest sum of three numbers whose faces come together at a corner?

$\text{(A)}\ 11 \text{(B)}\ 12 \text{(C)}\ 13 \text{(D)}\ 14 \text{(E)}\ 15$