(a). Canada and the United States of America
(b). Chile and Argentina
(c). China and India
(d). Kazakhstan and Russian Federation
Explanation:
The Canada and the United States of America border stretches for an impressive 8,891 kilometers (5,525 miles), making it the world's longest international land border. It traverses diverse landscapes, from the Atlantic and Pacific oceans to the Great Lakes and the Arctic.
Chile and Argentina: This border is indeed quite long, snaking along the Andes mountains for approximately 6,691 kilometers (4,160 miles). It's the second-longest land border in the Americas.
China and India: The Sino-Indian border is a complex one, with some disputed territories. The estimated length varies depending on the definition used, but it's generally around 3,440 kilometers (2,140 miles).
Kazakhstan and Russian Federation: This border stretches for a significant distance of approximately 7,644 kilometers (4,750 miles). It's the world's second-longest land border after the US-Canada one.
Therefore, the correct answer is Option (a).
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