Explanation:

- Correct Answer: Option 4 - Surya Kiran

- The 16th edition of the Indo-Nepal annual joint training exercise held in December 2022 was named "Surya Kiran." This exercise focuses on enhancing interoperability in jungle warfare and counterterrorism operations between the two armies.

- Option 1 - Sampriti

- This is a joint military exercise between India and Bangladesh. It focuses on strengthening military ties and enhancing interoperability between the forces of these two countries.

- Option 2 - Mitra Shakti

- This is a joint military exercise between India and Sri Lanka aimed at improving military cooperation and counterinsurgency operations.

- Option 3 - Yudh Abhyas

- This is a joint military exercise between India and the United States. It is aimed at enhancing defense cooperation and interoperability between the armies of both nations.

These exercises symbolize international military cooperation intending to improve coordination and readiness in various combat scenarios.