human
Question: Many cars are equipped with a catalytic converter, a device that helps remove hydrocarbons and oxides from car exhaust. As a result, this device helps to

Choices:
A) increase the production of ozone.
B) decrease the production of smog.
C) increase the emission of nitrogen.
D) decrease the emission of carbon dioxide.
gpt
The correct answer is 1: decrease the production of smog..