3. Arrange the following compounds in the order of increasing acidity.

(A) A＜B＜E＜C＜D
(B) E＜A＜B＜C＜D
(C)B＜A＜D＜C＜E
(D) B＜A＜E＜D＜C (5) C＜E＜B＜A＜D

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