Starting with Cyclohexanone, How Could You Prepare the Diketone Below

Multiple Choice

Starting with cyclohexanone, how could you prepare the diketone below?

A) Treat cyclohexanone with a base under thermodynamic conditions.
B) Hydrogenate cyclohexanone with Raney nickel.
C) Convert cyclohexanone into the a-bromoketone and then react this with the enolate of cyclohexanone.
D) Convert cyclohexanone into an enamine with diethylamine and then react this with more cyclohexanone.