Who among the following began excavations at Dholavira in 1990?

R.S. Bisht

The correct answer is Option 3 - R.S. Bisht

1990- R.S. Bisht (Ravindra Singh Bisht) began excavations at Dholavira.

Features of Dholavira, an important Harappan Civilisation site:
Water reservoirs were discovered in Dholavira, Gujarat, which might have served the purpose of storing water for agricultural needs.
Specialized drills were found at Chanhudaro, Lothal and Dholavira.
In certain sites like Dholavira and Lothal in Gujarat, the entire settlement was fortified, encompassing protective walls around the entire perimeter.