Answer:
B. Parasitism
Step-by-step explanation:
Parasitism is a not harmonical ecological relationship, that is, an interaction between living beings, one of which benefits from obtaining food while another is harmed.
The parasite is a living being that associates with another, which is called a host. The parasite uses the host to feed, causing disease. In many cases, the damage caused is usually not very serious, since if the host dies if the parasite will die as well.