The correct option is C cleaning water tank regularly
∙ Malaria is caused by parasites and is spread by mosquitoes.
∙ We can prevent malaria by protecting ourselves from a mosquito bite.
∙ Mosquito lay eggs in still water. Hence, stagnent water places should be cleaned regularly.
∙ By using mosquito repellent creams, nets and wearing clothes, we can limit the contact of mosquitoes with humans.