Which of the Following Is a Valid Characteristic of the U.S.economy

Multiple Choice

Which of the following is a valid characteristic of the U.S.economy over the last sixty years?

A) Investment is smoother than most of the other components of GDP,especially consumption.
B) Government spending has remained around 20% of GDP over much of the postwar period.
C) The U.S.has,for the most part,been running a trade surplus which has trended upward to over 5% of GDP.
D) all of the above
E) none of the above