The most accurate response is:
It has led to the creation of methods to prevent the disease.
Discovering the cause of malaria, specifically identifying the Plasmodium parasite and its life cycle involving mosquitoes, has enabled the development of various prevention methods. This includes measures such as insecticide-treated bed nets, antimalarial drugs for prophylaxis, and public health campaigns to reduce mosquito breeding habitats. While there is ongoing research into vaccines and treatments, malaria has not been eradicated, and a definitive cure is still a subject of ongoing study.