Commensalism is the mechanism in which one species is benefited, and the other is neither harmed nor helped.
Milkweed and monarch butterflies are two examples of commensalism.
Mutualism is a phenomenon in which both are benefitted. Some organisms work together and develop a mutual relationship. Aphids and ants demonstrate it.
Parasitism is the process in which one is benefitted, and the other is harmed. The parasite resides within or on the host's body. Tapeworms, fleas, and plasmodium are a few examples of parasites.
The sequential answer is B.commensalism, C.mutualism and A.parasitism.
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