E is the correct option.
if we can tell that there is another reason for the drop in wholesale prices of illegal drugs( reason is the drop in demand), then we can not entirely blame the program for not meeting its goal. it means we can not say that the program was a failure on its own. Thus the conclusion falls apart, which says the program was a failure.
if we can tell that there is another reason for the drop in wholesale prices of illegal drugs( reason is the drop in demand), then we can not entirely blame the program for not meeting its goal. it means we can not say that the program was a failure on its own. Thus the conclusion falls apart, which says the program was a failure.










