The Constitution provides for reservation of seats in the Lok Sabha and State Legislative Assemblies for the:

scheduled tribes

The correct answer is Option 1 - scheduled tribes

The Constitution of India provides for reservation of seats in the Lok Sabha and State Legislative Assemblies for the following categories:

Scheduled Castes (SCs)
Scheduled Tribes (STs)
These reservations are aimed at ensuring fair representation for historically disadvantaged communities in the legislative bodies.