Correct option is C
✅ (c) Brown spot disease of rice: • Caused by
Bipolaris oryzae, this disease was a major cause of the Bengal famine in 1943. • Destroyed large areas of rice crop, leading to food shortage and widespread starvation. • First plant disease to be linked with a human tragedy.
❌ (a), (b), (d): • Important rice diseases, but not the cause of the Bengal famine.