'x' is the product which is obtained by the hydrolysis of prop-1-yne in the presence of mercuric sulphate under dilute acidic medium at 333 K. 'y' is the product which is obtained by the reaction of ethane nitrile with methyl magnesium bromide in dry ether followed by hydrolysis. IUPAC name of product obtained from 'x' and 'y' in the presence of barium hydroxide followed by heating is :

A

2-Methylpent-4-en-3-one

B

4-Methylpent-3-en-2-one

C

4-Methylpent-1-ene

D

2-Methylpent-3-one