Answer:
I'm sorry i can't be more specific but both B) tariff reduction on imports. and C) a quota on imports and exports are technically both right I myself would choose C).
Step-by-step explanation:
Here is why when a tariff is reduced on an import it puts more rules and regulations on how the imports get in to countries.
While when a quota is put on an import or an export they are only allowed to let what there quota says in or out