What he is asking is this....
In the late 1990s the mexican government passed a number of laws concerning the manufacture and operation of automobiles. These included switching to cleaner-burning fuels, installing catalytic converters on new cars, requiring tougher vehicle inspections, and converting city buses in natural gas.
What was MOST LIKELY the purpose of these laws?
A.) to break their dependence on foreign oil
B.) to improve the air quality in urban areas
C.) to prevent major corporations from becoming too rich
D.) to stop industrial unions from going on a national strike
But the answer is B!