Some archaeological sites in Sikkim, like Rabdentse, are being developed as:

Places of pilgrimage
Tourist attractions
Military outposts
Research centers

The correct answer is: b) Tourist attractions.

Rabdentse is a ruined city in Sikkim, India. It was the capital of Sikkim from 1670 to 1793. The city is now a popular tourist destination, and is known for its well-preserved ruins.

The other options are incorrect because:

  • a) Places of pilgrimage: Rabdentse is not a place of pilgrimage.
  • c) Military outposts: Rabdentse is not a military outpost.
  • d) Research centers: Rabdentse is not a research center.