There 4 crust types, 2 sauces types, and 3 topping types. That is a total of 24 combinations. The answer is
(T, R, M), (T, R, O), (T, R, G), (T, W, M), (T, W, O), (T, W, G)
(H, R, M), (H, R, O), (H, R, G), (H, W, M), (H, W, O), (H, W, G)
(D, R, M), (D, R, O), (D, R, G), (D, W, M), (D, W, O), (D, W, G)
(S, R, M), (S, R, O), (S, R, G), (S, W, M), (S, W, O), (S, W, G)