Research Has Confirmed That the Immigration Reform and Control Act

Research has confirmed that the Immigration Reform and Control Act of 1986 (IRCA) provision:

A) increasing border patrols has greatly reduced the number of people entering the U.S. illegally.
B) requiring employers to verify citizenship has reduced the employment of illegal immigrants sharply.
C) for a one-time amnesty may actually have increased illegal immigration to the United States.
D) All of the above.