In a certain code language, ‘RANK’ is coded as ‘1892’ and ‘RAIN’ is coded as ‘9126’. What is the code for ‘I’ in the given code language?

Given: 

In a certain code language, ‘RANK’ is coded as ‘1892’ and ‘RAIN’ is coded as ‘9126’. 

R, A, N and 1, 2, 9 are common in both.

So, the code of I is 6.

Thus, correct option is (b).