A.
the
serves as a border between the northeastern united states and canada.
mackenzie river
b. mississippi river
st. lawrence river
d. rio grande
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C. St. Lawrence River

Explanation:

St. Lawrence River (originally called Kakanoaakakagaalla in Mohawk) is in the list of the main rivers in North America. In addition, in its first section it forms the natural border between the United States and Canada, bordering the west of the province of Ontario, and then entering Quebec and completely crossing it .

It should be noted that this river has an approximate length of 1,197 km and emanates directly from Lake Ontario.

tension is the type of stress that results when two tectonic plates diverge .

explanation: