The st. Lawrence is in the epicenter of a. THE GPD b. winter sports c. fishing d. trade between the US and canada

The St. Lawrence is in the epicenter of "trade between the US and Canada"

Explanation:

This river flows in the border region between these two states. It is flows through the region where the Great Lakes are located. As we know this is the region where the largest part of trade between these two states is being done. River St. Lawrence is one of the largest and most important rivers in Canada. It is located in the eastern part of the country. It flows through the area where some of the most important cities such as Ottawa, Montreal and Quebec are located. It is also in the area near the US border.