Which pathogen is polyletic in nature?

Answer: Option B

Ceratocystis pathogen is polyletic in nature.
Ceratocystis fimbriata is a fungus and a plant pathogen attacks such diverse plants as the sweet potato. It is a diverse species that attacks a wide variety of annual and perennial plants.
Ceratocystis fimbriata produces ascospores, and these spores are found at the top of fruiting bodies known as perithecia. These ascospores enter and infect new plants through wounds on any part of the plant/tuber/etc and are commonly dispersed by insects, wind and equipment.
Polylectic refers to an insect that collects pollen from the flowers of a variety of unrelated plants.