Which of the Following Is True

Which of the following is true?

A) The decade of the 1990s witnessed monumental political and social events that impacted the world and the Olympic movement.
B) With the collapse of the Soviet Union and the fall of the Berlin Wall, Germany was once again a united nation and would field a formidable Olympic team composed of athletes from the former East Germany with those of West Germany.
C) The two most serious problems facing the Olympic Games are drugs and the commercialization of the Olympics.
D) The International Olympic Committee made the decision to stagger the Olympic Games on a two-year rotation instead of a four-year rotation. By doing this, the IOC would be able to produce the Olympic Games (summer or winter games) every two years.
E) All of the above.