Option 1 -> No mention of any appointments or time pressure in the passage.
Option 2 -> The slides came later; the hurrying happened specifically at the anteroom entrance.
Option 3 -> The assistant "tried to hurry him past" the anteroom where Mangala was conducting questionable healing practices on syphilitic patients - clearly attempting to conceal this activity from Farley's view.
Option 4 -> The people were openly present in the anteroom as part of Mangala's operation, not hidden by the assistant.
Hence, Option 3 -> The passage explicitly states "The assistant tried to hurry him past" when Farley noticed activity in the anteroom, and Farley only saw inside "by dint of dragging his feet." The assistant was deliberately trying to prevent Farley from witnessing Mangala's deceptive healing practices, which Farley later recognizes as "quackery" and "falsehoods" that should be exposed -> correct