Step 1: Understanding the Concept:
Millets are a diverse group of small-seeded, annual warm-season grasses grown as cereal crops.
They are highly drought-resistant and adaptable to marginal environments with poor soil fertility.
Step 2: Detailed Explanation:
Let us evaluate each of the listed crops:
1. Jowar (Sorghum, Sorghum bicolor): Also known as sorghum or great millet, it is classified as a major millet crop in India.
2. Ragi (Finger millet, Eleusine coracana): A highly nutritious small millet crop rich in calcium and dietary fiber, cultivated in arid and semi-arid regions.
3. Bajra (Pearl millet, Pennisetum glaucum): The most widely grown millet in India, adapted to dry, sandy soils with low rainfall.
4. Wheat (Triticum aestivum): A major cereal crop grown in temperate and cool subtropical regions during the winter (rabi) season.
Unlike the C$_4$ photosynthetic millets, wheat is a C$_3$ plant with larger grains and different agronomic requirements.
It is classified as a staple cereal crop rather than a millet.
Step 3: Final Answer:
Wheat is not a millet crop, which corresponds to Option (B).