46. For the following compounds the correct order for decreasing reactivity toward nucleophilic acyl substitution is(A) II＞III＞IV＞I (B) I＞IV＞II＞III (C)III＞II＞I＞IV (D) I＞IV＞III＞II (E) IV＞III＞II＞I