Step 1: Context of the Tashkent Agreement
The Tashkent Agreement was signed on January 10, 1966, in Tashkent, Uzbekistan, between India and Pakistan. The agreement aimed to restore peace and normalise relations between the two nations after the 1965 India-Pakistan war. The key leaders who signed the agreement were Lal Bahadur Shastri (Prime Minister of India), Ayub Khan (President of Pakistan), and the Soviet Premier, Leonid Brezhnev, as a mediator.
Step 2: Analyzing the Options
- (A) India-Pakistan: Correct. The Tashkent Agreement was signed between India and Pakistan following the 1965 war, facilitated by the Soviet Union.
- (B) India-Nepal: Incorrect. The Tashkent Agreement involved India and Pakistan, not Nepal.
- (C) India-Sri Lanka: Incorrect. This agreement was not between India and Sri Lanka.
- (D) India-Bhutan: Incorrect. The Tashkent Agreement was not between India and Bhutan.
Step 3: Conclusion
The correct answer is (A), as the Tashkent Agreement was signed between India and Pakistan in 1966 to restore peace between the two countries.
\[
\boxed{\text{Correct Answer: (A) India-Pakistan}}
\]