Assuming that word is LABOUR and RANK startes from 1
In order to find dictionary order,lets first arrange the alphabets in dictionary order,we get :- A B L O R U
We need to find Rank of LABOUR, we know from the alphabet order that first words starting with A will come,then starting with B,then starting with L
1. Starting with A :- If A is the first alphabet,then we are left with 5 more alphabets which has maximum possible permutations as 5!.
2.Starting with B:- same as above
So till now we have fixed words staring with A and B which gives us total as 5!+5!=240 words.
3. Starting with L:-If L is first alphabet,then we rae left with 5 letters.Lets form the first possible word with them as: LABORU,which will have rank as 241.
Next word will be LABOUR which is our required word with rank 242.
D is the answer here,