The correct option is D Clean surroundings
∙ Cholera is caused due to contaminated food and water. It is spread by houseflies. Hence, food and water should be covered properly.
∙ Insecticides can be used to keep houseflies away.
∙ Clean surroundings free from garbage will prevent houseflies in the surroundings.
∙ Protective clothing helps in the prevention of malaria.