AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
The answer is D — Rabi.
In states like Assam, West Bengal and Odisha, three crops of paddy grown in a year are Aus, Aman and Boro. Rabi is a separate cropping season (wheat, gram, etc.), not a paddy crop.
The passage from the Cropping Pattern section of Chapter 4 directly states: "In states like Assam, West Bengal and Odisha, three crops of paddy are grown in a year. These are Aus, Aman and Boro." Rabi is a winter cropping season, not a variety/crop of paddy, making D the correct answer. Remember: Aus (pre-kharif), Aman (kharif), and Boro (summer/irrigated) are the three paddy crops of eastern India.