The united states placed a limit on the number of cars that can be brought into the country for sale. this is an example of
a. an import quota.
c. a customs duty.
b. a tariff.
d. a voluntary export restraint.

The United States placed a limit on the number of cars that can be brought into the country for sale. This is an example of "an import quota".

An import quota is a limit on the measure of imports that can be brought into a specific nation.  

For instance, the US may restrict the quantity of Japanese vehicle imports to 2 million every year.  

Quotas will decrease imports, and help residential providers. In any case, they will prompt more expensive rates for buyers, a decrease in monetary welfare and could prompt countering with different nations setting taxes on our exports.

agriculture and oil. natural resources, industry.

the answer is     d. in our global economy, most job growth will be in services, but manufacturing jobs will exist, too.