Explanation:

- Option 1: 1925

- This option is incorrect. In 1925, there were developments in aviation globally, but the Indian sector wasn’t inaugurated yet.

- Option 2: 1932

- India’s aviation sector began with the establishment of Tata Airlines in 1932.

- Tata Airlines, later Air India, marked the inception of commercial aviation in India.

- This is the correct answer.

- Option 3: 1929

- While aviation was growing worldwide, there was no major milestone in Indian aviation during 1929.

- Option 4: 1935

- This option is incorrect. By 1935, Tata Airlines was already operating, as it started in 1932.