What indicators showed that the local authorities could not handle the riot situation in Tulsa? Firemen were the only group available to handle the violent mobs.
They were beaten back by brutal groups who hated Rowland.
They refused to take action against mobs, for fear of retaliation.
They had to call in higher authorities and impose martial law.

Is this a question were you can choose two? I would say "Firefighters were the only group available to handle the violent mobs" & " They had to call higher authorities and impose martial law."

Explanation:

If it is a single choice. I would choose the second statement I listed. Good luck!

500 books can be produced by one man and a printing press within 5 months, while a copyist can only produce one in the same amount of time

c. more people could read and interpret the bible for themselves