The serves as a border between the northeastern united states and canada.
a. mackenzie river
b. mississippi river
c. st. lawrence river
d. rio grande

The (C) St. Lawrence River serves as a border between the Northeastern United States and Canada. The St. Lawrence Rive is located in the middle latitude of North America. It is a large river that flows north-easterly direction. It serves as an international boundary between Canada, Ontario and US (New York).

c is the correct answer

Explanation:

Answer (d) may increase or decrease porosity through dissolution or deposition;