Explanation: Jammu and Kashmir is a state in India that is known for its strategic location and its complex geopolitical situation. The state shares borders with two international countries: Pakistan and China. The border with Pakistan is known as the Line of Control (LoC), which is the de facto border between the Indian-administered and Pakistani-administered parts of the former princely state of Jammu and Kashmir. The border with China is known as the Line of Actual Control (LAC), which is the demarcation line between the Indian and Chinese-administered areas of the former princely state.
The total length of the international borders of Jammu and Kashmir is approximately 1,744 kilometers (1,084 miles). This makes it the state with the largest international border in India. The border with Pakistan is about 744 kilometers (462 miles) long, while the border with China is about 1,000 kilometers (621 miles) long. The presence of these international borders makes Jammu and Kashmir a critical region for India's national security and foreign policy.
In contrast, other states in India do not share such extensive international borders. For example, Rajasthan shares a border with Pakistan, but the length of this border is much shorter than the international borders of Jammu and Kashmir. Similarly, Tamil Nadu, located in southern India, shares a maritime border with Sri Lanka but does not have a land border with any international country.
Understanding the geographical and geopolitical significance of Jammu and Kashmir is crucial for comprehending the complex relationships between India, Pakistan, and China. The state's international borders play a significant role in the region's security dynamics and are often a point of contention in diplomatic and military relations. Therefore, Jammu and Kashmir is the correct answer as it shares the largest border with international countries among the given options.