Which of the Following Events Challenged Keynesian Views, and Led

Multiple Choice

Which of the following events challenged Keynesian views, and led to the popularity of Milton Friedman's ideas?

A) The hippie community started advocating socialist values.
B) Hard-core republicans came into office.
C) The U.S.economy faced high levels of inflation and unemployment simultaneously.
D) The oil crisis exploded.
E) Countries that followed Friedman's ideas performed better.