Concept:
This question tests knowledge of the political geography of Northeast India. The "Seven Sister States" share borders with several neighboring countries, including Bhutan, China, Bangladesh, and Myanmar. Understanding the specific alignment of these states along the Indo-Myanmar Barrier is essential.
Step 1: Analyzing Manipur's Geographical Boundaries.
Manipur is a landlocked state in northeastern India. It is bounded by the following Indian states:
• Nagaland to the north
• Mizoram to the south
• Assam to the west
To its east, it shares a significant international boundary.
Step 2: Identifying the International Border.
Manipur shares a long international border with Myanmar (formerly Burma). The length of this specific border section is approximately:
$\text{Border Length} \approx 398 \text{ km}$
The total Indo-Myanmar border is about 1,643 km long, stretching across four states: Arunachal Pradesh, Nagaland, Manipur, and Mizoram.
Step 3: Strategic Significance.
The border between Manipur and Myanmar is geographically significant due to the "Moreh" border town, which serves as a major commercial hub and the gateway to South-East Asia under India's "Act East Policy."
Final Answer: Option D