Macroeconomics First Developed as a New Subfield of Economics

Multiple Choice

Macroeconomics first developed as a new subfield of economics:

A) when Adolph Hitler ordered economists to learn more about national economies.
B) following the oil price increases of the 1970s.
C) as a result of Adam Smith's publication of The Wealth of Nations in 1776.
D) in response to the severe economic hardships of the Great Depression.