What mistake did Powell make that night?

• A. Going into Mary Surratt's boarding house.
• B. Entering the boarding house from a side entrance.
• C. Wearing a bright scarf to mislead searchers.
• D. Carrying a forged pass to gain access.

Answer: (A)

Powell’s mistake was going into Mary Surratt's boardinghouse that night. That boardinghouse in Washington became a central hub for the conspirators, a place where plans were discussed and where several members moved in and out. By entering it, Powell exposed himself to witnesses and connected him directly to the group behind the plot. The location allowed investigators to tie him to the conspiracy more easily, making his cover more fragile and traceable. In this context, sticking to his assigned action and avoiding the conspirators’ meeting point would have reduced the chance of being identified with the plot.