Answer:
A. If Canada were to allow trade, it would export hockey sticks
Step-by-step explanation:
A Comparative advantage is said to exist when one nation sacrifices fewer resources than another to produce same quantity of a product. It means the nation with lower opportunity cost (in terms of units of production of other good sacrificed), than others, holds a comparative advantage.
In the given case, Canada sacrifices fewer (i.e 5 bats against 8 bats) units of baseball bats to produce a hockey stick, than other nations.
This means Canada holds a comparative advantage relative to other countries, in production of hockey sticks.
Hence, if Canada were to allow trade, it would export hockey sticks.