How Did World War I's Committee on Public Information (CPI)

How did World War I's Committee on Public Information (CPI) inspire business in the 1920s?

A) The wartime experience proved that the best way to prevent overspeculation on the stock market was to inform the public of its dangers.
B) Business leaders hired private data collectors to measure the effects of propaganda on consumers.
C) The CPI's success suggested government intervention could have a positive impact on business growth.
D) Public relations departments were established in many firms to counteract bad publicity.