Explanation:

- Option 1: 1982

- This is incorrect. The Project Tiger initiative did not start in 1982. This year does not align with the historical start of the project, but it was during the broader timeline of conservation efforts in India.

- Option 2: 1992

- This is incorrect. By 1992, Project Tiger was already well underway, and this year is not associated with its inception.

- Option 3: 1979

- This is incorrect. Project Tiger was already running by 1979 and this year does not mark its beginning.

- Option 4: 1973

- This is the correct answer. Project Tiger was officially launched in 1973. It was a significant conservation program initiated by the Government of India to protect the Bengal tiger and preserve its habitats.