The correct option is A Baeyer - villiger oxidation
The given reaction is known as Baeyer - villiger oxidation.
In this reaction, acetone is heated with perbenzoic acid to form methyl acetate.
When an unsymmetrical aliphatic ketone is used, the oxygen atom is inserted between carbonyl carbon and the larger alkyl group.
However, if the ketone is aromatic, then both products are obtained.