This Graph Demonstrates the Domestic Demand and Supply for a Good,as

This graph demonstrates the domestic demand and supply for a good,as well as a tariff and the world price for that good.
According to the graph shown,if the economy was operating under autarky,and decides to open trade with a tariff,the impact on domestic supply is:

A) they will increase output from 250 to 500.
B) they will decrease output from 815 to 500.
C) they will increase output from 500 to 815.
D) they will decrease output from 1500 to 1150.