Explanation:

- Correct Answer: Option 2 - Australia

- The exercise "Pitch Black" is a biennial air combat training event hosted by the Royal Australian Air Force.

- It involves various countries coming together in Australia to conduct large-scale air combat operations.

- Option 1: New Zealand

- New Zealand does host military exercises, but they are mostly focused on regional security.

- "Pitch Black" is not held in New Zealand.

- Option 3: United States

- The United States conducts its own air combat exercises such as "Red Flag."

- It is a major participant in international drills but doesn't host "Pitch Black."

- Option 4: Canada

- Canada has military exercises like "Maple Flag," focusing on similar training.

- "Pitch Black" is not conducted in Canada.

- Option 5: Japan

- Japan hosts various joint exercises, particularly with the United States.

- "Pitch Black" is not one of these exercises.

India's participation in these exercises underscores its focus on enhancing defense collaborations and combat readiness with countries like Australia.