Correct option is A
✅ (a) Mustard: • Mustard sawfly (Athalia lugens proxima) is a serious pest of mustard and other cruciferous crops. • Larvae feed on leaves, leading to defoliation and reduced yield. • Managed through insecticides or cultural practices like timely sowing.
❌ (b), (c), (d): • Lentil, cotton, and paddy are affected by other specific pests.