What made it possible for a middle-class adivasi intellectual leaders…

The correct answer is Option (3) → Literate adivasis were in a position to get government jobs

Option (1) Adivasis received most of the benefits from the mining and industrial projects — Incorrect. The benefits of the mining and industrial projects went to dikus, the migrant traders and moneylenders. Adivasis lost their lands instead, and this sense of injustice fed the movement.

Option (2) Adivasis gained land through the survey and settlement operations in the region — Incorrect. Survey and settlement operations were an issue the Jharkhand leaders agitated against. They held the operations up and closed down camps, so these gave them no land.

Option (3) Literate adivasis were in a position to get government jobs — Correct. Literacy spread by missionaries put adivasis in a position to get government jobs. Over time this produced a middle-class adivasi intellectual leadership that formulated the demand for a separate state.

Option (4) Adivasis took over the collection of rent and cooperative dues in the region — Incorrect. The collection of loans, rent and cooperative dues was resisted by the movement. Adivasis opposed this collection as one of their grievances and never took it over.