Use the figure to help determine which of the following statements are true.

A$.$ The U$.$S$.$ net federal debt to GDP ratio has been, for the most part, decreasing since the end of$.$ World War II$,$ despite the fact that the U$.$S$.$ economy was expanding and could afford a larger debt to GDP ratio.

B$.$ As a result of the exceptionally large increases in U$.$S$.$ government military expenditures in the first half of the $1940\text{'}$s$,$ that were needed to win World War II$,$ the net U$.$S$.$ public debt to GDP ratio increased substantially, surpassing $100\%.$ Since the late $1950\text{'}$s however, U$.$S$.$ net federal debt to GDP ratio has fluctuated within a relatively small bend around the $40\%$ line.

C$.$ The net U$.$S$.$ federal debt to GDP ratio follows a panern that cannot have a meaningful interpretation.

D$.$ Net federal debt in the U$.$S$.$ changes according to the will of the president and Congress, who behave unpredictably; therefore, it will be impossible to understand what generates annual public deficits, which give rise to the net federal debt.

U$.$S$.$ Gross Net Federal Debt as a Percentage of$.$GDP

Net Federal Debt, percentage of GDP