Option 1 -> No indication in the passage that they were criminals hiding.
Option 2 -> The scarred faces were from syphilis, not burns or bruises - the passage explicitly identifies them as "syphilitics."
Option 3 -> They were in attitudes of supplication before Mangala, not waiting for Farley specifically.
Option 4 -> Farley recognized they were "syphilitics, in the final stages of the terrible disease" and knew "mankind knew on cure for their condition."
Hence, Option 4 -> Farley diagnosed them as suffering from advanced syphilis and understood there was no cure available for their condition, which is why his conscience troubled him about the woman's quackery giving them false hope -> correct
Option 4 is correct according to NTA. Marks will be awarded to only those who select Option 4