The correct answer is B) Dryland areas.
Millets are a group of cereal crops that are grown in dryland areas. They are drought-tolerant and can grow in poor soils. Millets are a staple food for millions of people around the world, and they are also used to make a variety of products, such as flour, porridge, and beer.
In Karnataka, millets are grown in the dryland areas of the state. These areas are characterized by low rainfall and poor soils. Millets are well-suited to these conditions, and they are an important part of the agricultural economy of Karnataka.
The other options are incorrect. Option A, Irrigated plains, is incorrect because millets are not well-suited to irrigated areas. Option C, Hilly regions, is incorrect because millets are not well-suited to hilly areas. Option D, Coastal areas, is incorrect because millets are not well-suited to coastal areas.