Complete the statement with the correct numerical response. There are ways to arrange the letters A, B, C, D.

Step 1 ：The problem is asking for the number of ways to arrange 4 distinct items. This is a permutation problem. The formula for permutations is n!, where n is the number of items. In this case, n is 4, so the answer should be 4!.

Step 2 ：Calculate the factorial of 4: \(4! = 24\)

Step 3 ：Final Answer: There are \(\boxed{24}\) ways to arrange the letters A, B, C, D.