Refer to the Data Above to Answer This Question

Refer to the data above to answer this question.Suppose that initially each country allocated 5 million of its population to the rice industry,the rest being employed in the beer industry.If they now decide to totally specialize in the products in which each has a comparative advantage,what will be the resulting gains from trade?

A) 0 rice and 25 beer.
B) 1 rice and 1 beer.
C) 35 rice and 35 beer.
D) 21 rice and 0 beer.