15. In Figure 2, composed of numbers and letters, there are ( ) different paths to spell out AMC8. Requirement: Each path starts from the letter A in the middle of the figure, and allows passing through adjacent letters or numbers once (can move up, down, left, or right, but not diagonally). For example, Figure 2 marks one path that meets the condition.
(A) 8
(B) 9
(C) 12
(D) 24
(E) 36
15. D.

By the multiplication principle, we know that the desired result is
$$
1 \times 4 \times 3 \times 2=24 \text {. }
$$