Answer: B. Mexico has a comparative advantage in grain production.
Explanation:
Comparative advantage simply means when an economy can produce a good at a lower opportunity cost than another economy.
From the information given, since Canada can produce 15units of timber or 3 units of grain. Therefore, 1 grain = 15/3 = 5 timber
On the other hand, Mexico can produce 6 units of timber or 2 units of grain. Therefore, 1 grain = 6/2 = 3 timber.
Therefore, Mexico haa a comparative advantage in grain based on the above.