The given statement is the example of a Mutualistic relationship.
Answer: Option C
Step-by-step explanation:
The symbiotic relationship existing among the living organism can be classified as three types namely Mutualism, Parasitism, and commensalism. In mutualism, both the organism in the relationships is mutually benefited. In case of commensalism, one of the partners gains whereas the other remains in dormant state. In parasitism one organism is gained whereas the other organism is harmed.
In the condition given in the question as the Dinoflagellates and coral are helping each other it is considered as Mutualistic relationship.