6. Which reaction conditions can complete the following transformation? (3%)
(A) \( \text{H}_2 \), Pt
(B) \( \text{H}_2 \), Lindlar's catalysts
(C) \( \text{NaBH}_4 \)
(D) 9-BBN, \( \text{CH}_3\text{CO}_2\text{H} \)
(E) Li, \( \text{NH}_3 \), \( -78 \, ^\circ\text{C} \)

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