Answer:
Correct answer is a- Geometric .
Step-by-step explanation:
A is the correct answer as the border is practically like a line that goes along the 49 parallel.
B is not correct as people in both states are speaking English language.
C is not correct also, as we have members of same religions in both countries.
D is not correct as in some parts, like around the lakes the boundary is physical, but mostly as we have said it follows the 49 parallel.