Final answer:
Quebec is the largest producer of hydroelectricity in Canada, thanks to its extensive river systems and capacity for hydroelectric generation.
Step-by-step explanation:
The largest producer of hydroelectricity in Canada is Quebec. While Ontario may have the largest population and British Columbia has significant hydroelectric capacity thanks to features like the Columbia River, Quebec's vast network of dams and power stations, particularly the James Bay Project, make it the leading producer of hydroelectric power in the country. This is due to the province's extensive river systems and high water-flow rates that are conducive to hydroelectric generation. Therefore, the correct answer is c) Quebec.