In the following question, the sentence/passage is split into four parts and named P, Q, R and S. These four parts are not given in their proper order. Read the sentence and find out which of the four combinations is correct and mark it.

P. However unlike the Monetarists, they argue that the key cause of the Depression

Q. There are two prominent theorists in the Austrian School on the Great Depression, Austrian economist Friedrich Hayek and American economist Murray Rothbard

R. Was the expansion of the money supply in the 1920s, of which led to an unsustainable credit-driven boom

S. In their view, much like the monetarists, the Federal Reserve (created in 1913) shoulders much of the blame