- Statement I is accurate: Wheat cultivation is prevalent in the western Indo-Gangetic plains of India, notably in Punjab and Haryana.
- Statement II is inaccurate: Wheat is not exclusively grown in monsoonal regions; it thrives in cooler climates, including the Indo-Gangetic plains and northern China.
- Statement III is accurate: Millets are cultivated in arid regions, primarily western and southern India, owing to their drought resistance.
- Statement IV is accurate: Wheat, soybean, and other crops are extensively grown in northern China, especially in areas like the North China Plain.
Consequently, statements I, III, and IV are correct, identifying option (C) as the accurate choice.