what is the range of the relation?

{( 1 , 2) , (2 , 4) , (3 , 2) , (4 , 6)}

A{ 1 , 2 , 3 , 4)

B{ 1 , 2 , 3 , 4 , 6}

C{ 2 , 4 , 6 }

DD. {2 , 4}