Which development would best serve as a turning point between two historical periods?
O A. A historian publishes biographies of some of the lesser-known
British monarchs.
O B. A corporation and a labor union agree to a new contract that
offers workers a small raise.
O C. A civil war results in the dismantling of an empire and the creation
of two new countries.
D. A city legislature agrees to lower taxes on businesses to improve
the local economy.