If Canada’s currency depreciates, the most relevant consequence among the options provided is:
Canada’s imports become more expensive.
When a country's currency depreciates, it means that it takes more of that currency to buy the same amount of foreign goods or services, leading to increased costs for imports. Conversely, a weaker Canadian dollar can make Canadian exports cheaper for foreign buyers, potentially boosting exports. The other options listed (stopping trade, losing NAFTA position, and exports becoming more expensive) are not accurate in the context of currency depreciation.