Step 1: Understanding the Concept:
India-China relations reached an all-time low following the 1962 border war. Diplomatic ties were severed for years, and even after they were restored in 1976, the relationship remained cold and characterized by mutual suspicion. A high-level political intervention was required to break the deadlock and establish a new framework for cooperation.
Step 2: Detailed Explanation:
The visit that fundamentally changed the trajectory of the relationship was made by Rajiv Gandhi in December 1988.
1. Historical Context: No Indian Prime Minister had visited China since Jawaharlal Nehru in 1954. For 34 years, the shadow of the 1962 conflict hung over every interaction. Although Indira Gandhi had restored ambassadorial ties in 1976, and Atal Bihari Vajpayee had visited as Foreign Minister in 1979, the relations had not "normalized."
2. The Breakthrough: Rajiv Gandhi's visit was a bold diplomatic move. He met with the legendary Chinese leader Deng Xiaoping. During this meeting, both sides agreed that the boundary dispute was a complex issue that would take time to resolve.
3. The New Policy: The most significant outcome was the decision to decouple the border issue from other aspects of the relationship. They agreed that while they continued to talk about the border, they would simultaneously improve ties in trade, technology, and culture. They also set up a Joint Working Group (JWG) to maintain "peace and tranquility" along the Line of Actual Control (LAC).
4. Impact: This visit paved the way for the massive growth in India-China trade that followed in the 1990s and 2000s. It shifted the relationship from "hostility" to "managed competition and cooperation."
5. Other Leaders: While Vajpayee (2003) and Manmohan Singh also made important visits, Rajiv Gandhi's 1988 visit is the "ice-breaker" in modern Sino-Indian history.
Step 3: Final Answer:
Rajiv Gandhi's visit in 1988 is credited with the "thaw" in Sino-Indian relations. Therefore, (B) is the correct option.