How many provinces and states does Lake Ontario arise from?

Lake Ontario is bordered by two provinces and two states. Specifically, it lies to the north of New York state in the U.S. and to the south of Ontario in Canada. Additionally, the lake is also influenced by the provinces of Quebec and Manitoba, as well as the states of New York and Pennsylvania, but primarily it is the two provinces (Ontario, Canada) and two states (New York, USA) that directly border the lake. This geographic relation is pivotal for understanding the lake's environmental and economic significance in both nations. The other options misrepresent the actual number of bordering regions, either undercounting or overcounting the involved provinces or states.