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A person suffering from a disease caused by Plasmodium, experiences recurring chill and fever at the time when
the sporozoites released from $RBCs$ are being rapidly killed and broken down inside spleen
the trophozoites reach maximum growth and give out certain toxins
the parasite after its rapid multiplication inside $RBCs$ ruptures them, releasing the stage to enter fresh $RBCs$
the microgametocytes and megagametocytes are being destroyed by the $WBCs.$
Solution
(c) : Plasmodium is a tiny protozoan which is responsible for malaria in the human. In malaria the patient experiences high fever which periodically rises and also experiences recurring chills with fever. Such symptoms are seen because when the $RBCs$ carrying Plasmodium (one of the stage in the life cycle of the parasite) ruptures it releases a toxic substance called haemozoin which is chiefly responsible for the chill and high fever recurring every three to four days.
