The correct option is C Plasmodium falciparum
Plasmodium falciparum is a protozoan parasite, one of the species of Plasmodium that cause malaria in humans. It is transmitted by the female Anopheles mosquito. Malaria caused by this species (also called as malignant or falciparum malaria) is the most dangerous form of malaria with the highest rates of complications and mortality. Thus, the correct answer is option C.