Which statement concerning oxides of nitrogen is correct?
- AThey are made in car engines by the incomplete combustion of gasoline at a high temperature.
- BThey are made in car engines when nitrogen in gasoline reacts with oxygen in air at a high temperature.
- CThey are removed from car exhausts by catalytic converters and form nitrogen and sulfur dioxide.
- DThey are removed from car exhausts when they react with carbon monoxide in catalytic converters.