Step 1: Analyse options.
- (a) Indira Gandhi and Z.A. Bhutto signed Tashkent Agreement: This is incorrect. The Tashkent Agreement was signed between Indira Gandhi and Z.A. Bhutto in 1966, not as an example in this question. The Tashkent Agreement was related to post-1965 war relations.
- (b) Ayub Khan and Indira Gandhi signed Simla Agreement: This is incorrect. The Simla Agreement was signed in 1972 between Indira Gandhi and Zulfikar Ali Bhutto (not Ayub Khan).
- (c) Jawaharlal Nehru and Zhou-en-Lai signed Panchsheel: Correct. The Panchsheel Agreement was signed in 1954 between Jawaharlal Nehru and Zhou-en-Lai, which established mutual respect for sovereignty, non-aggression, non-interference, and peaceful coexistence.
- (d) V.P. Singh and Nawaz Sharief signed Lahore Convention: This is incorrect. The Lahore Convention was signed between Atal Bihari Vajpayee and Nawaz Sharief in 1999, not V.P. Singh.
Step 2: Conclusion.
The correct answer is (c), as the Panchsheel Agreement was signed between Jawaharlal Nehru and Zhou-en-Lai.
Final Answer: (c) Jawaharlal Nehru and Zhou-en-Lai signed Panchsheel.