The program to control the entry of illegal drugs into the country was a failure in 1987. If the program had been successful, the wholesale price of most illegal drugs would not have dropped substantially in 1987.
The argument in the passage would be most seriously weakened if it were true that

Question

Examsnet · Accepted Answer

Correct Answer is : domestic production of illegal drugs increased substantially in 1987

GMAT Verbal Reasoning Practice Test 5