Empirical Research Has Shown That

Empirical research has shown that:

A) in the 1990s and 2000s, velocity was more sensitive to an increase in the opportunity cost of holding money than in the 1980s.
B) in the 1990s and 2000s, velocity was less sensitive to an increase in the opportunity cost of holding money than in the 1980s.
C) during the 1980s and 1990s, the velocity of money was not sensitive to changes in the opportunity cost of holding money.
D) during the 1980s and 1990s, the velocity of money actually decreased as the opportunity cost of holding money increased.