An example of a quantity restriction is an import quota. (Option B). See explanation for same below.
What is import quota?
Import quotat is a kind of restriction that is used to control the maount of goods that is allowed into a country.
Sometimes it is used to restrict the quality of goods whose consumption the government wants to discourage.
Hence, it is correct to state that an example of a quantity restriction is an import quota. (Option B).
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