Answer: C.the relationships are probably mutual or parasitic
Explanation:
Commensalism is a symbiotic association in which one species receives the benefit for association the other remains unaffected. The beneficiary species may receive shelter, nutrients, and support from the host species.
The biologists believe that the commesalism does not exists due to the fact that mostly all organisms live in either parasitic or mutual relationship. As the commesalism can be considered as unrealistic as the host may not allow the commensal or beneficiary species to be associated for long without receiving any benefit.