Which of the Following Is/are Challenge(s) Faced by Law Enforcement

Which of the following is/are challenge(s) faced by law enforcement when it comes to transnational crimes?

A) Permission must be granted by the host country before U.S. authorities can operate there.
B) Host countries may tolerate certain transnational crimes.
C) The governments of some host countries may be corrupt.
D) ​Coordination between the United States and foreign countries may be difficult.
E) ​Some countries have less transnational crime than others.