Explanation:

- Correct Answer: Option 4 - Andhra Pradesh

- AMPHEX 2023, a biennial tri-services amphibious exercise, was conducted from January 17 to 22, 2023, along the coastal regions of Andhra Pradesh.

- This exercise involves all three branches of the Indian Armed Forces – the Army, Navy, and Air Force – showcasing their joint operational capabilities in amphibious warfare, which is crucial for projecting power from the sea to the land.

- Option 1: Bihar

- Located in the north-central part of India, Bihar is a landlocked state with no coastline, making it an unlikely venue for an amphibious exercise.

- Option 2: Telangana

- Also a landlocked state located in the south-central region of India, thus not suitable for conducting exercises focused on amphibious operations.

- Option 3: Odisha

- Though Odisha does have a coastline along the Bay of Bengal, the specific AMPHEX 2023 was not conducted there.

- Conducting AMPHEX in Andhra Pradesh takes advantage of its strategic location along the eastern coast, providing access to maritime routes and a suitable environment for amphibious exercises.