Assume That the World Economy Consists of Two Countries: Russia

Assume that the world economy consists of two countries: Russia and Republic of Belarus. Each country can produce tomatoes and potatoes. Russia can produce 1000 tons of tomatoes or 3000 tons of potatoes or any linear combination of tomatoes and potatoes that satisfies potatoes + 3 × tomatoes = 3000. Republic of Belarus can produce 500 tons of tomatoes or 1000 tons of potatoes or any linear combination of tomatoes and potatoes that satisfies potatoes + 2 × tomatoes = 1000. Countries can freely trade with each other.
-If the price of potatoes is $300 per ton,with free trade the price of tomatoes can be any of the numbers below EXCEPT

A) $600
B) $750
C) $900
D) All of these numbers can be the equilibrium price of tomatoes