What is one theme that sets the modern era apart from previous time periods?
A. Industrialization
B. Cross-cultural communication
C. Trade
D. Religious intolerance

A.
Explanation:
The Industrial Revolution, also known as First Industrial Revolution, took place in Europe and America in latter half of the eighteenth century. This period marked the beginning of urban cities and industries from agrarian and rural societies.
The theme that sets modern era apart from the previous era is the development of industrial technology. This period brought a major shift not just economically but socially and politically as well. Politically, this period saw a shift from monarchy to democracy, and social hierarchy also changed.
So, the correct answer is option A.

The answer would be advertising.