Two isomeric hydrocarbons X and Y ($$\text{C}_4\text{H}_6$$), give the same product ($$\text{C}_4\text{H}_8\text{O}$$) on catalytic hydration with dilute acid. However, they form different products but with same molecular formula ($$\text{C}_4\text{H}_6\text{Br}_4$$) when treated with excess bromine. X and Y are

A

B

C

D