Along with Lake Champlain, which other lake straddles the Vermont / Canada border?

Memphremagog is the correct choice because this lake is situated in the northeastern part of North America and extends across the border between the United States and Canada. Specifically, Memphremagog is located in both Vermont and the Canadian province of Quebec, making it a significant water body that directly straddles the international boundary, similar to Lake Champlain.

Lake of the Woods, located in Canada and parts of Minnesota, does not share a border with Vermont and is situated much further west. Lake Superior, one of the Great Lakes, also does not interact with Vermont, as it is far to the northwest of the state. Lake Michigan is entirely within the United States and does not border Canada at all, remaining disconnected from Vermont’s geographical context. Thus, Memphremagog stands out as the only lake in this list that meets the criteria of straddling the Vermont and Canada border, alongside Lake Champlain.