The correct answer is: B. are held
The Olympic Games are an international sports festival held once every four years. The original Greek games were staged every fourth year for several hundred years, until they were abolished in the early Christian era. The revival of the Olympic Games took place in 1896, and since then they have been staged every fourth year except during World War I and World War II (1916, 1940, and 1944).
The Olympic Games are held in a different city each time. The host city is chosen by the International Olympic Committee (IOC), which is the governing body of the Olympic Movement. The IOC also sets the rules and regulations for the Olympic Games, and it selects the sports that are included in the Games.
The Olympic Games are the world’s largest and most prestigious sporting event. They attract athletes from all over the world, and they are watched by billions of people around the globe. The Olympic Games are a symbol of international cooperation and peace, and they are a celebration of human achievement.
The options A, C, and D are incorrect because they are not in the past tense. The Olympic Games are held, not holding, helded, or hold.