C - prey
i - predator
a - parasitism
f - commensalism
d - competition
The answer its c hope it help
Answer: The prospective approach.
Explanation: The prospective approach in a study looks out for product or result of the study. In this approach, a research/study is concluded based on the outcome. For example in the development of a drug, the study will involve testing different methods and concluding based on outcomes.
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