Wolff-Kishner reduction (hydrazine, KOH, ethylene glycol, 130°C) of the compound shown gav...

Wolff-Kishner reduction (hydrazine, KOH, ethylene glycol, 130°C) of the compound shown gave compound A. Treatment of compound A with m-chloroperoxybenzoic acid (MCPBA) gave compound B, which on reduction with lithium aluminum hydride gave compound C. Oxidation of compound C with chromic acid gave compound D (C9H14O). Identify compounds A through D in this sequence.