In Regard to the 2004 Athens Olympics, Which of the Following

In regard to the 2004 Athens Olympics, which of the following is true?

A) Security against terrorists was the primary concern of Greece, the IOC as well as the 200+ Olympic teams who would send athletes and officials.
B) There were approximately 45,000 security personnel assigned to protect athletes, officials, and fans during the games.
C) When US Secretary of State Colin Powell announced that he would attend the Opening Ceremonies, . a riot took place in Athens and Powell cancelled his trip.
D) All of the above
E) None of the above