The correct option is B Gibberella fujikori
In Japan (in early 1800's), certain rice plants suffers from bakanae (foolish seedling) disease. Such rice plants were thin, pale green, spindle shaped, longer by 50% than the healthy plants, and were sterile. The disease was found by Hori and Kurosawa to be caused by a fungus. Gibberella fujikori. The fungus is the perfect stage of Fusarium moniliforme.