The correct option is A Aposematism
Aposematism is a set of antipredatory warning signals that convey to the predator that the specific organism is unpalatable. For eg. the bright red and orange colours of many butterflies. The stink of the skunk etc. Batesian mimicry however is a smart strategy adopted by some preys to avoid predators, they mimic the colours of the poisonous organisms to fool their predators into thinking that they are unpalatable. Competition is an interaction between organisms where they fight each other for resources and parasitoidism is a relationship where an organism that spends a significant portion of its life history attached to or within a single host organism in a relationship that is in essence parasitic; unlike a true parasite, however, it ultimately sterilizes or kills, and sometimes consumes, the host.