The correct answer is A) Chamarajanagar.
Chamarajnagar district has the highest percentage of Scheduled Tribe population in Karnataka, with 30.9% of its population belonging to Scheduled Tribes. The district is home to a number of tribal groups, including the Soliga, Yerava, and Betta Kuruba. The Soliga are the largest tribal group in the district, accounting for over 10% of the population. They are a forest-dwelling people who traditionally practice shifting cultivation. The Yerava are also a forest-dwelling people, but they are more mobile than the Soliga and often live in small groups. The Betta Kuruba are a hill tribe who live in the Western Ghats. They are a pastoral people who herd cattle and goats.
The other options are incorrect because they do not have the highest percentage of Scheduled Tribe population in Karnataka. Chikmagalur district has 22.5% of its population belonging to Scheduled Tribes, Kodagu district has 18.5%, and Uttara Kannada district has 16.3%.
Scheduled Tribes are a group of people who are considered to be indigenous to India. They are officially recognized by the Indian government and are entitled to certain benefits, such as reservation in government jobs and education.