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).
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
I think the first one is South, and the second one is North
It helped end slavery by having people realize why it was bad so they could abolish slavery.
