Discussion

Explanation:

In the given input the logice used is:
From Input to Step 1 - 1st word is exchanged with 3rd, 4th is exchanged with 5th and 6th is exchanged wiht 7th.
From Step 1 to Step 2 - 1st word is exchanged with 2nd, 3rd is exchanged with 5th and 6th is exchanged with 7th.
From step to step 3 - 1st word is exchanged with 2nd, 3rd is exchanged with 4th and 5th is exchaned with 7th.
From Step 3 to Step 4 - Same as Step 1.
From Step 4 to Step 5 - Same as Step 2 and
From Step 5 to Step 6 - Same as Step 3
Therefore Step 5 for the Inpur in Question will be
cannot sorry feel him but for one
And, Step 6 for the same input will be
sorry cannot him feel one for but
Considering the given explanation 
If the step 6 for any given inpur is "the best way of promoting our nation", then the input of the arrangement will be "promoting best nation of the our way".
As it can be observed that for the input "One cannot but feel sorry for him" the 6th step is "sorry cannot him feel one for but", where the first word in the input is 5th word in 6th step, 3rd word in the input is 7th word in the 6th step and so on. 
Hence, option (c).

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