Which of the following pairs of countries shares the longest continuous international land border in the world? |ForumIAS

[A] Canada and the United States of America

[B] Chile and Argentina

[C] China and India

[D] Kazakhstan and Russian Federation

Answer: A

Notes:

Explanation:

Canada – United States border: Extends over (including the Alaska border), making it the longest international land border between two countries globally.
Kazakhstan – Russia border: (2nd longest).
Argentina – Chile border: (3rd longest).
China – India border (LAC): .