Association in which both the organisms get benefited is __________________.
Mutualism refers to ecological association between two organisms of different species which mutually get benefitted by their association. In commensalism, one organism gets benefitted and the other is neither benefitted nor harmed. In amensalism, one organism is destroyed and the other remains unaffected. In parasitism, one organism (parasite) lives inside other organism (host) and harms its host.
Correct answer is B.