Which of the Following Statements Regarding the Effect of "Deterrence

Which of the following statements regarding the effect of "deterrence by sentencing" on the crime rate in the United States and Canada is true?

A) Rates of crime seem to remain unaffected by deterrence by sentencing in both countries.
B) Rates of crime vary greatly between countries and it is impossible to compare the two.
C) Rates of crime decreased with increased imprisonment, as expected.
D) Rates of crime in both countries actually increased with increased imprisonment.