Step 1: Understanding the Tashkent Agreement.
The Tashkent Agreement was signed in 1966 between India and Pakistan to resolve the conflict following the 1965 war. The agreement was facilitated by the Soviet Premier, Alexei Kosygin, who acted as a mediator in the peace talks between the two countries.
Step 2: Analysis of options.
- (A) India, Nehru: Incorrect. Jawaharlal Nehru was not involved in the Tashkent Agreement as he had passed away before the 1965 war and the subsequent agreement.
- (B) USSR, Kosygin: Correct. The Tashkent Agreement was brokered by the Soviet Union under Premier Alexei Kosygin, who facilitated the talks between India and Pakistan.
- (C) Egypt, Nasser: Incorrect. While Nasser was an influential leader in the Middle East, he was not involved in the Tashkent Agreement.
- (D) USA, Kennedy: Incorrect. John F. Kennedy was not involved in the Tashkent Agreement, as it took place after his presidency.
Step 3: Conclusion.
The correct leader and country that helped in reaching the Tashkent Agreement was Alexei Kosygin from the USSR.
Final Answer:} (B) USSR, Kosygin.