The correct option is B STTIBUDIONRI
Divide BR EA KT HR OU GH
1 2 3 4 5 6
These are coded as pairs 2,5,4,1,6,3 to get the code ' EAOUHRBRGHKT'.
In the same way, dividing the letters of the words DISTRIBUTION in pairs
DI ST RI BU TI ON
1 2 3 4 5 6
Arranging these pairs in the order 2,5,4,1,6,3, we get the required code as STTIBUDIONRI.
Hence, option (C) is the correct answer.