Sorry, my picture is a little blurry. The correct answer is C, but I am not sure how my professor got this answer. Is someone able to explain this to me?

10) Use the following graph, where Sa and Da are the domestic supply and demand curves for a product, to answer the next question. $16 14 12 10 Price N Da 10 20 30 40 50 60 70 80 90 Quantity The world price of the product is $6. If an import quota of 40 units is imposed on the product, then the equilibrium price would be _ and the quantity consumed would be 10 units. 10) A) $6; 80 B) $10; 60 C) )$8; 70 D) $12; 50