Final answer:
Quebec is the leading province in Canada for the production of pulp and paper, due to its extensive forest resources and developed industry infrastructure.
Step-by-step explanation:
The province that is Canada's main producer of pulp and paper is Quebec. Quebec's vast forests provide an abundant supply of raw material that is essential for the pulp and paper industry. In fact, the province has developed a large infrastructure over time to support this sector, including mills and a skilled workforce. While other provinces like British Columbia and Ontario also have significant production, Quebec is recognized for being the leader in this industry in Canada.