Identify the reagent required to complete the syntheses shown below.

• A. H₂SO₄, H₂O
• B. 1. Hg(OAc)₂, H₂O; 2.NaBH₄, NaOH
• C. 1. O₃; 2. H₂O₂
• D. 1. BH₃/THF; 2. H₂O₂, HO^-, H₂O

Answer: (D)