Question

what is the purpose of quotas?
to ban all imports from a country
to ensure specific goods are not available to consumers
to limit how much of a good can be imported
to keep prices on domestic goods low

Explanation:

Quotas are trade - related measures. They set a limit on the quantity of a particular good that can be imported into a country. This is a common tool in international trade to protect domestic industries, manage trade balance, etc.

Answer:

to limit how much of a good can be imported