Sikkim state of India shares international boundary with which of the following group of countries?

China, Nepal and Bhutan

The correct answer is Option (3) - China, Nepal and Bhutan

Sikkim state of India shares international boundary with China, Nepal and Bhutan.

China: China borders the northern region of Sikkim.

Nepal: Nepal flanks Sikkim along its western border.

Bhutan: Bhutan lies to the east of Sikkim, completing its international borders.