In Germany in the Early 1920s,on Average

In Germany in the early 1920s,on average,

A) prices were rising 50 percent every month, while the quantity of money was rising 20 percent every month.
B) prices were doubling every month, while the quantity of money fell 10 percent every month.
C) prices were tripling every month, while the quantity of money remained almost constant every month.
D) prices and the quantity of money both tripled every month.