Which of the following is considered as the major landmark in the Indo-China relations in the 1980s?

Rajiv Gandhi’s visit to China

The correct answer is Option 3 - Rajiv Gandhi’s visit to China

Rajiv Gandhi’s visit to China in December 1988 provided the impetus for an improvement in India–China relations. Since then both governments have taken measures to contain conflict and maintain ‘peace and tranquility’ on the border.