1. Since the September 11, 2001 attacks on New York City and Washington D.C. , the United States government has:

A. Established a Department of Homeland Security, with responsibility for (among other things) controlling who enters the United States from other countries
B. Begun more thorough examination of applicants for student visas (and other kinds of visas)
C. Required colleges and universities to report foreign students who fail to enroll full time
D. Required colleges and universities to report foreign students' spouses who change their U.S. address
E. All of the above
F. A, B, and C above