Correct option is B
✅ (b) Loose smut of Wheat: • Caused by
Ustilago tritici, this smut is internally seed-borne. • The fungus lives dormant inside the embryo of infected seeds and germinates along with the plant. • Managed through seed treatment with systemic fungicides.
❌ (a), (c), (d): • These are externally seed-borne or soil-borne smuts.