The Pax Romana started after Augustus, then Octavian, met and defeated Mark Antony in the Battle of Actium in 31 BCE. Augustus created a junta of the greatest military magnates and gave himself the titular honor. By binding together these leading magnates into a single title, he eliminated the prospect of civil war.
The answer is D. The colonies have the right to separate from Great Britain. They felt that they were being treated unfairly under British rule. Hope this helps! :)