The correct answer is: a) East Khasi Hills
East Khasi Hills is a district in the state of Meghalaya in north-eastern India. It is the most populous district in Meghalaya, with a population of over 1.4 million people. The district is known for its numerous prehistoric sites, including the Dawki Stone Circle, the Nokrek National Park, and the Mawphlang Sacred Forest.
The Dawki Stone Circle is a megalithic monument located in the Dawki village in East Khasi Hills district. It is a circular arrangement of stones, with a diameter of about 100 meters. The stones are believed to have been erected by the Khasi people in prehistoric times.
The Nokrek National Park is a national park located in the East Khasi Hills district. It is home to a variety of wildlife, including tigers, elephants, and deer. The park is also home to the Nokrek Peak, which is the highest peak in Meghalaya.
The Mawphlang Sacred Forest is a sacred forest located in the Mawphlang village in East Khasi Hills district. It is home to a variety of trees and plants, including the sacred fig tree. The forest is also home to a number of temples and shrines.
The other options are incorrect because they are not districts in Meghalaya. West Garo Hills is a district in the state of Meghalaya, Ri-Bhoi District is a district in the state of Meghalaya, and South West Khasi Hills is a district in the state of Meghalaya.