71. Which of the following series of synthetic steps could be used to carry out the transformation shown below?
(I) NaOH, (II) heat, (III) CH3COCH2COOEt, EtONa, (IV) NaOH, heat, then HCl, H2O
(A) I → II → III → IV
(B) IV → II → I → III
(C) III →IV → II → I
(D) II → IV → III → I
(E) None of the above
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