What is the closing sentence in the second paragraph?
选项：

A:The IOC is responsible for choosing the host city for each Olympic Games.
B:The Olympic Games offer an opportunity to the host country to show off their city to the world.
C:Nearly every nation in the world is represented in the Olympic Games.
D:There are more than 13,000 athletes who compete in the summer and winter Olympics in 33 different sports with a total of almost 400 events.