Final answer:
The subject of this question is B. Industrial Revolution, which was a period of rapid industrialization and economic growth. This resulted in improved income and living standards.
Step-by-step explanation:
The subject of this question is the Industrial Revolution.
The Industrial Revolution refers to the period of rapid industrialization and economic growth that occurred in Western Europe and North America in the 18th and 19th centuries.
During this time, there was a shift from agricultural and handiwork production to manufacturing, leading to improved income and living standards.