The correct answer is Dakshina Kannada.
Dakshina Kannada is a district in the Indian state of Karnataka. It is located on the west coast of India, and is known for its beautiful beaches, temples, and wildlife sanctuaries. The district has a population of over 2.5 million people, and its capital is Mangalore.
Dakshina Kannada is a relatively developed district, with a high literacy rate and a strong economy. The district is home to a number of industries, including agriculture, manufacturing, and tourism. Dakshina Kannada is also a major educational hub, with a number of colleges and universities.
The other options are incorrect because they are not districts in Karnataka that are known for relatively high human development. Gadag is a district in the northern part of Karnataka, and is known for its historical temples. Bidar is a district in the central part of Karnataka, and is known for its historical forts. Raichur is a district in the northern part of Karnataka, and is known for its agricultural production.
In conclusion, the correct answer to the question “A district in Karnataka known for relatively high human development” is Dakshina Kannada.