Empirically, a large amount of evidence suggests that money neutrality ____ but changes in money supply ____
a. holds in the short run; can have real effects in the long run
b. does not hold in the long run; have an effect on unemployment in the long run
c. holds in the long run; can have real effects in the short run
d. does not hold in the long run; can have real effects in the short run
e. holds in the short run; do not affect nominal variables