Answer: C. Modern era.
Explanation:
The modern era is the time frame after post-classical history. It can be further divided into periods.
The early modern period starts around the early 16th century and has the European Renaissance, the Age of Discovery, and the Protestant Reformation as the most important historical events.
The late modern period starts approximately in the mid-18th century and holds the American Revolution, the French Revolution, the Industrial Revolution, the Great Divergence, and the Russian Revolution.
Contemporary history includes historic events since around 1945 that are directly related to the present time.