Four pairs of numbers have been given, out of which three are alike in some manner, while one is different. Choose out the odd one.

785 : 256

option (1) 178  : 637

              1+7+8 = 6+3+7

                    16 = 16

option (2) 152 : 800

             1+ 5+ 2 = 8+0+0

                       8 = 8

option (3) 852 : 960

           8+5+2 = 9+6+0

                  15 =  15    

option (4) 785  :  256

        7 + 8+ 5 = 2 + 5+ 6

                 20 ≠ 13