Name a major Canadian river that is important for shipping and hydroelectric power.

• A. Mackenzie River
• B. Fraser River
• C. Nelson River
• D. St. Lawrence River

Answer: (D)

Think about a river that serves as a crucial highway for moving goods and also hosts big power plants along its route. The St. Lawrence River does just that. It connects the Great Lakes to the Atlantic Ocean, forming the Great Lakes–St. Lawrence Seaway, which is the main shipping corridor in eastern Canada and the United States. Large ships can travel from interior ports to the Atlantic, with locks to navigate different water levels, making it a central hub for trade. At the same time, several major hydroelectric stations sit along the river, supplying a lot of electricity to Quebec and the surrounding region. That combination of heavy commercial shipping and significant power generation is why this river is the best answer. The other rivers don’t fit as well: one is more important for western shipping with less scale hydroelectric power, another is a major hydro site but not a primary shipping route, and the northern Mackenzie has limited commercial shipping due to ice and geography.