C - prey
i - predator
a - parasitism
f - commensalism
d - competition
Answer:
Explanation:
Canada is the largest foreign supplier of crude oil (25% of oil imports) and natural gas to the United States. In short, this energy relationship has enhanced U.S. energy security and provided Canada with a steady demand for its energy exports.
please mark brainlest
I think it is D mild I am just guessing.