QUIZ 6
          (Z)

          |+|                                             1
         /   \                                           ---
        /     \                   1     4 + 5             6
       /       \           (A)  ----- + -----     (B)  -------
      /         \               2 + 3     6             2 + 3
   |/|           |/|                                    -----
  /   \         /   \           2 + 3     6             4 + 5
 /     \       /     \     (C)  ----- + -----
1      |+|   |+|      6           1     4 + 5
       / \   / \
      2   3 4   5

(Z)  -->  (A) | (B) | (C) ?
(Z) -->