there are 3 types of symbiotic relationships which are mutualism, commensalism and parasitism
mutualism is when both of the organisms (partners) have benefits so answer for that one is B
commensalism is when one of the partners or species has benefits while the other partner doesn’t get benefits and isn’t harmed in the process. answer for that one is E
parasitism is when one organism (known as parasites) has benefits while the other one suffers (known as the host) answer so that one is C