The serve and fatal malaria is caused by Plasmodium species
P. falciparum
Malaria is a life-threatening disease. It’s typically transmitted through the bite of an infected Anopheles mosquito. Infected mosquitoes carry the Plasmodium parasite.
Plasmodium causing malaria are of following types.They are P.vivax, P.ovale, P.malariale, and P.falciparum
The serve and fatal malaria are caused by Plasmodium falciparum species.
So, the correct answer is 'P. falciparum'.