A Good Method of Evaluating a Country's Amount of National

A good method of evaluating a country's amount of national debt,according to the authors,is

A) looking at the raw amount of debt, without any fancy statistics.
B) looking at the amount of debt controlling for inflation.
C) dividing the debt as a percentage of the amount of U.S. currency in active circulation.
D) dividing the debt as a percentage of gross domestic product.
E) comparing the net debt load today to the net debt load in the same month, but ten years ago.