In 2008, China welcomed thousands of athletes as they hosted the Olympic Games. During this time, some countries arranged for their athletes to train in neighboring countries while some were photographed arriving at Beijing's airport wearing face masks issued to them by team officials. Factories in Beijing and the surrounding region were ordered to shut down weeks ahead of the opening ceremony. Nineteen days before the Games were due to start, officials’ implemented restrictions on the use of private automobiles in the city. 1implemented: put into effect Which environmental issue was a big concern for many of the athletes? A. The intake of polluted air leading to illness. B. The seasonal rains would have an impact on the competition. C. The city lacked fresh drinking water during this time. D. The temperatures would be too hot to compete.