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

4284 : 18

4284 ==> 4+2+8+4 = 18

1482 : 15

1482 ==> 1+4+8+2 = 15

? : 16

Now we need to check options one by one to get the sum of digits within the number as 16.

Option (a) 3854 ==> 3+8+5+4 = 20

The above given logic is not applicable here. So this is not the correct answer.

Option (b) 2854 ==> 2+8+5+4 = 19

The above given logic is not applicable here. So this is not the correct answer.

Option (c) 1486 ==> 1+4+8+6 = 19

The above given logic is not applicable here. So this is not the correct answer.

Option (d) 3256 ==> 3+2+5+6 = 16

The above given logic is applicable here. So this is the correct answer.