Option 1 -> Arunachal Pradesh borders China (north), Bhutan (west), and Myanmar (east).
Option 2 -> Bangladesh does not share a border with Arunachal Pradesh.
Option 3 -> Bangladesh does not share a border with Arunachal Pradesh.
Option 4 -> This excludes China, but Arunachal Pradesh does share a northern border with China.
Hence, Option 1: (A), (B) and (C) only -> Arunachal Pradesh shares international borders with three countries: China to the north (along the McMahon Line, a disputed border), Bhutan to the west, and Myanmar to the east. Bangladesh is located further south and does not share any border with Arunachal Pradesh -> correct