What might avert the danger of the building up of a high concentration of aerosols

A．created goodwill between the nations
B．bred only false national pride
C．barely showed any international friendship
D．led to more and more misunderstanding and hatred

A．The organization of the Olympic Games must be improved.
B．Athletes should compete as individuals in the Olympic Games.
C．Sport should be played competitively rather than for the love of the game.
D．International contests are liable for misunderstanding between nations.