In which symbiotic relationship does one organism benefit while the other organism is harmed?
a.
mutualism
b.
commensalism
c.
parasitism
d.
competition
i will friend and for best answer

Parasitism. It is a non-shared connection between species, where one species, the parasite, benefits to the detriment of the other, the host. Customarily parasite alluded fundamentally to living beings unmistakable to the bare eye, or macroparasites.

It is a parasitic relationship, where parasite is benefitted and the host if harmed. Example of this includes, tapeworm which attaches themselves onto the intestine of the animals like pig, cow wtc, and use their undigested food, and cause nutrition deprivation in them.