To arrange compounds in decreasing acidic strength, we compare the stability of their conjugate bases.

However, the actual structures labeled A, B, C, D are not present in the prompt. The options given are only possible orders:

• Option A: $A > B > C > D$
• Option B: $B > A > C > D$
• Option C: $D > C > A > B$
• Option D: $D > C > B > A$

Step 1: What is required to solve this?

For acidity comparison in organic chemistry, we must know the structures of $A, B, C, D$ and analyze factors such as:

1. Resonance stabilization of conjugate base
2. Inductive effect
3. Hybridization
4. Aromaticity / antiaromaticity
5. Electronegativity and substituent effects

Without the molecular structures, the acidity order cannot be derived logically.

Step 2: Can the correct option be determined from the provided text alone?

No. Since compounds $A, B, C, D$ are missing, there is insufficient information to independently verify the order.

Step 3: Comparison with stored correct answer

The stored correct answer is A, i.e. $A > B > C > D$

But because the structures are absent, I cannot genuinely derive or validate this order from the given data.

So I do not have enough information to confirm the stored answer by chemical reasoning.