The correct answer is (a) East Khasi Hills.
East Khasi Hills is the most populous district in Meghalaya, with a population of over 2.5 million people. The district is home to the capital city of Shillong, which is also the state’s commercial and cultural center. East Khasi Hills is a major tourist destination, known for its natural beauty, including its mountains, forests, and waterfalls. The district is also home to a number of important historical and cultural sites, including the Mawphlang Sacred Forest and the Nongpoh Coronation Ground.
The main economic activity in East Khasi Hills is agriculture, followed by mining and tourism. The district is a major producer of rice, maize, and potatoes. Mining is also an important industry in the district, with coal being the main mineral extracted. Tourism is a growing industry in East Khasi Hills, with the district attracting visitors from all over the world.
The in-migration to East Khasi Hills is due to a number of factors, including the district’s economic opportunities, its natural beauty, and its cultural heritage. The in-migration has led to a number of challenges, including increased pressure on natural resources, housing, and infrastructure. The government of Meghalaya is working to address these challenges, and is developing plans to manage the growth of the district.
The other options are incorrect because they are not the most populous districts in Meghalaya. West Khasi Hills has a population of over 1.5 million people, East Jaintia Hills has a population of over 1 million people, and Ri-Bhoi has a population of over 700,000 people.