What can be a simple sign of crop disease?

Correct answer: Spots on leaves or wilting

Direct answer: Option A is correct. A crop disease is a harmful condition caused by pathogens, pests or other factors, and plants often show visible changes. Spots, unusual discolouration, curling, rotting or wilting can be warning signs. The reasoning is: disease affects normal plant tissues; damaged tissues may change colour or lose water; therefore spots or wilting can alert a farmer to inspect the crop. Option A gives two simple observable signs. Option B, proper irrigation, is a good farming practice, but it is not itself a sign of disease; overwatering can even create problems. Option C, good germination, indicates successful early growth rather than disease. Option D, clean storage, concerns post-harvest hygiene and does not show disease in a growing crop. A sign is not always final proof, so the plant should be examined further, but option A is the best answer. Memory cue: inspect leaves—spots and wilting are warning flags.