The compounds X and Y in the following reaction are
`CH_(3)-underset("Y ")underset(darr "Ethonic KOH")(CHCl_(2) overset("Zn dust")underset(CH_(3)OH)rarr)X`
A. `{:("X Y"),(CH_(3)-CH_(3) " " CH_(2)=CHCl):}`
B. `{:("X Y"),(CH_(2)=CH_(2) " " CH_(2)=CHCl):}`
C. `{:("X Y"),(CH_(2)=CH_(2) " " CH-=CH):}`
D. `{:("X Y"),(CH_(2)=CH_(2) " " CH_(2)=CH_(2)):}`