Explanation:

- Option 1: Industry

- At the time of independence, India's industrial sector was underdeveloped.

- There were few industries, mostly limited to textiles, jute, and small manufacturing units.

- It was not the primary occupation for the majority of the population.

- Option 2: Services

- The service sector was not well-developed during the time of independence.

- It included a small segment like trade, transport, and government jobs.

- The majority was still engaged in other sectors.

- Option 3: Agriculture

- Agriculture was the backbone of the Indian economy.

- It employed the largest section of the Indian population.

- Most people were involved in farming and related activities.

- Option 4: None of these

- This option doesn't apply as agriculture was the dominant sector.