73. In order to synthesize the final product shown below, predict when should a protecting group be added and when should it beremoved?
(A) The hydroxyl group should be protected before step I and removed after step I
(B) The hydroxyl group should be protected before step I and removed after step II
(C) The hydroxyl group should be protected before step I and removed after step III
(D) The hydroxyl group should be protected before step II and removed after step III
(E) There is no need for a protecting group in this synthesis.