The correct answer is (d) Aw.
The Köppen climate classification system is a system for classifying climates based on their monthly mean temperature and precipitation. The system was first published by Wladimir Köppen in 1884, and has been modified several times since then.
The Köppen climate classification system divides climates into five main groups: tropical, dry, temperate, continental, and polar. Each of these main groups is then divided into sub-groups, based on the average temperature and precipitation of the region.
The climate of the Great Plains of India is classified as Aw, which is a tropical savanna climate. Tropical savanna climates are characterized by hot, wet summers and warm, dry winters. The average temperature in the Great Plains of India ranges from 20°C to 30°C, and the average annual precipitation is about 1,000 mm.
The other options are incorrect because they do not accurately describe the climate of the Great Plains of India. Option (a), Amw, is a tropical monsoon climate. Tropical monsoon climates are characterized by hot, wet summers and cool, dry winters. The average temperature in the Great Plains of India is higher than the average temperature in a tropical monsoon climate, and the average annual precipitation is lower. Option (b), As, is a tropical steppe climate. Tropical steppe climates are characterized by hot, dry summers and cool, dry winters. The average temperature in the Great Plains of India is higher than the average temperature in a tropical steppe climate, and the average annual precipitation is higher. Option (c), Cwg, is a warm temperate climate. Warm temperate climates are characterized by cool, wet winters and warm, dry summers. The average temperature in the Great Plains of India is higher than the average temperature in a warm temperate climate, and the average annual precipitation is lower.