Answer:
C) Territorial disputes between Pakistan and India
Step-by-step explanation:
India and Pakistan have long disputed ownership of the mountainous Kashmir region, and the tenses have actually morphed into armed conflicts in several occasions.
A) is incorrect because Iceland is one of the most ethnically homogenous countries in the world.
B) is incorrect because despite huge culture wealth within Mexico, this diversity has not been a source of dispute.
D) is incorrect because the United States and Canada have the longest non militarized, peaceful border in the world between two individual countries.