This question concerns the special safeguards the land acquisition law builds in for Scheduled Tribes, so each option can be tested against whether it accurately reflects those safeguards.
Only the option requiring both the Social Impact Assessment and Gram Sabha consultation and consent, as genuine preconditions to acquisition, matches how the law actually protects Scheduled Tribes land.
The correct answer is therefore that SIA and Gram Sabha consultation/consent are mandatory for ST land; acquisition can't proceed without consent.