Chronic Abuse of Methamphetamine Reduces the Number of Dopamine Transporters

Chronic abuse of methamphetamine reduces the number of dopamine transporters in the caudate nucleus and putamen,which may explain why these addicts

A) are rarely overweight.
B) develop depression while abusing this drug.
C) are more likely to develop Parkinson's disease as they age.
D) move on to "harder" drugs as they get older.
E) are less likely to develop Parkinson's disease as they age.