The correct answer would be option C, Quota.
If a country limits the number of cars it will import, it is using the Quota System.
Explanation:
When a limited quantity of a product is produced, imported in or exported out of the country under the control of officials, then this type of system is called as the quota system.
For example, if a government of a country restricts that during the year, only xyz number of cars are being imported, it means government is limiting the amount of a product imported in the country. This is referred to as a quota system.
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