Consider the following statements: I. Assam shares a border with Bhutan and Bangladesh II. West Bengal shares a border with Bhutan and Nepal III. Mizoram shares a border with Bangladesh and Myanmar Which of the statements given above are correct?

All three statements are correct. Assam shares frontiers with both Bhutan and Bangladesh, as shown in listings of neighbouring countries and the Indian states that border them. West Bengal borders Bhutan (listed among states touching Bhutan) and is explicitly named among the five Indian states that touch Nepal, confirming its Nepal frontier [1]. Mizoram is located at the southern tip of the Northeast and shares international boundaries with both Bangladesh and Myanmar, as noted in project and state descriptions that identify its borders with those two countries [1]. Therefore I, II and III are all correct.

Sources

1. [1] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 16: India–Political Aspects > India-Nepal Boundary > p. 46
2. [2] https://documents1.worldbank.org/curated/en/521361468294066317/pdf/PID-Print-P145778-09-06-2013-1378449633766.pdf