Correct Answer: Bhutan

Solution : The correct option is Bhutan .

Bhutan is one of the countries that shares a land boundary with India . Their shared border stretches for 699 kilometres , primarily following the Himalayan mountain range. Bhutan's mountainous terrain and remote location, along with strong diplomatic ties, contribute to a peaceful and stable border relationship between the two countries. Bhutan shares borders with West Bengal (183 km), Sikkim (32 km), Arunachal Pradesh (217 km) and Assam (267 km), covering diverse landscapes.