The correct term is parasitism. That is option B.
Malaria is a type of disease that is usually caused by the bite of a female anopheles mosquito.
The insect transmits protozoan called plasmodium, which completes its cycle in the living human host with the display of the following symptoms:
Since the protozoan that causes malaria is very harmful and often kills its host, it has a parasitic feeding relationship with the host.
Parasitism is a mode of nutrition where an organism lives on or in another organism known as host, causing harm or death to the host.
Therefore the correct term is parasitism.
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