Select the number from among the options given that is related to the fifth number in the same way as the second and fourth numbers are related to the first and third numbers respectively.

15 : 90 :: 203 : 1015 :: 16 : X

Given: 15 : 90 :: 203 : 1015 :: 16 : X

Logic: Sum of digit of the first number is multiplied by the first number to get the second number.

15 → 1 + 5 = 6
15×6=90
203 → 2 + 0 + 3 = 5
203×5=1015

Similarly; 
16 → 1 + 6 = 7
16×7=112
Thus, the correct option is (d) 112.