For the effective control of early blight of potato, which fungicide is most suitable

Answer: Option B

For the effective control of early blight of potato, Dithane M-45 fungicide is most suitable.
Dithane F-45 fungicide is a broad-spectrum fungicide containing the active ingredient mancozeb. It is a contact fungicide with high protectant activity to control a wide range of fungal diseases. Dithane has been registered for use on dozens of crops for more than 50 years.
For prevention use throughout the growing season, spray potatoes every seven days. For treatment, apply within three days of the first signs of blight.