For the following reaction sequence, what are the correct structures of products A through D?


◦ A is IV, B is II, C is III, and D is I
◦ A is I, B is III, C is II, and D is I
◦ A is I, B is II, C is III, and D is IV
◦ A is III, B is II, C is IV, and D is I
◦ A is II, B is I, C is VI, and D is III