The correct answer is option 2, Barley. The shaded area in the map of India indicates the distribution of barley crops across the country. Barley is a type of cereal grain that is widely cultivated in various regions of India. It has the ability to grow in a wide range of climates and soil conditions, making it suitable for cultivation in many parts of the country.

Option 1, Bajra, is a type of millet crop that is predominantly grown in the western and central parts of India, particularly in states like Rajasthan, Maharashtra, and Gujarat. This does not match with the shaded area on the map, which is not showing the distribution of Bajra.

Option 3, Maize, is a type of corn crop that is cultivated in many parts of India. However, the shaded area on the map does not correspond to the distribution of maize crops.

Option 4, Wheat, is one of the major cereal crops grown in India and is widely cultivated throughout the country. However, the shaded area on the map does not represent the distribution of wheat crops.

Therefore, the correct answer is option 2, Barley, as it matches with the shaded area on the map indicating the distribution of barley crops in India.