21) Which air pollutants can react with chemicals in the atmosphere and cause acid rain ? A. Carbon dioxide (CO2 ) and methane (CH4) B. Sulfur dioxide (SO2 ) and nitrogen oxides (NOX) C. Nitrogen oxides (NOx) and volatile organic compounds (VOCs) D. Chlorofluorocarbons (CFCs ) and volatile organic compounds VOCs )

B. Sulfur dioxide (SO2) and nitrogen oxides (NOX)