Select the option that is related to the fourth number in the same way as the first number is related to the second number and the fifth number is related to the sixth number.

4284 : 18 :: ? : 16 :: 1482 : 15

3256

Pattern followed is :

4284 : 18

4 + 2 + 8 + 4 = 18

1482 : 15

1 + 4 + 8 + 2 = 15

Similarly ,

? : 16

find sum of each option one by one & 3256 satisfy the condition .

3256

3 + 2 + 5 + 6 = 16

3256 , is correct answer .