The correct answer is: D) Millets
Millets are a group of cereal crops that are commonly grown in dry, tropical and subtropical regions. They are a major source of food for millions of people around the world, and are also used as animal feed. Millets are drought-tolerant and can be grown in areas where other crops cannot. They are also relatively low-maintenance, making them a good choice for farmers with limited resources.
Rice is a cereal crop that is widely grown in Asia and other parts of the world. It is a staple food for many people, and is also used to make a variety of products, such as noodles, rice paper, and sake. Rice is a water-intensive crop, and requires a lot of rainfall or irrigation to grow.
Wheat is a cereal crop that is widely grown in temperate regions around the world. It is a staple food for many people, and is also used to make a variety of products, such as bread, pasta, and beer. Wheat is a cool-season crop, and does not require as much heat as rice.
Sugarcane is a grass that is grown for its sugar content. It is a major source of sugar for many countries, and is also used to make a variety of products, such as ethanol, paper, and textiles. Sugarcane is a tropical crop, and requires a lot of heat and sunlight to grow.
In conclusion, the correct answer to the question “A type of crop commonly grown under rain-fed conditions in Karnataka” is D) Millets.