Key areas of disagreement between China and India are:
1. Border Disagreements: The unresolved territorial boundary, particularly concerning the Aksai Chin area in Ladakh, is a significant point of conflict due to differing territorial claims.
2. Water Resource Conflicts: India expresses concern over China's management of the Brahmaputra River and proposed dam projects in Tibet, fearing negative impacts on downstream water availability for its population.
Potential solutions include:
- Diplomatic Engagement: Ongoing bilateral discussions to foster mutual understanding and achieve a peaceful resolution of the border dispute.
- Water Management Pacts: Implementing treaties and monitoring systems for shared rivers to ensure fair water distribution and utilization.
Therefore, option (a) is the correct response.