83. Sort the following compounds in decreasing order by their pKa valuesCfrom highest to lowest).
(A) I＞Ⅱ＞Ⅲ＞Ⅳ
(B) IV＞Ⅲ＞Ⅱ＞I
(C)IV＞Ⅱ＞Ⅲ＞I 
(D)Ⅲ＞I＞Ⅱ＞IV
(E)I＞Ⅲ＞Ⅱ＞I

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統計： A(2), B(2), C(14), D(3), E(0) #3222850