Hi there!
I believe ur best answer choice is C
Answer:
The foreign relations of Canada are Canada's relations with other governments and nations. Britain was the chief foreign contact before World War II. Since then Canada's most important relationship, being the largest trading relationship in the world, is with the United States.
1. Warsaw Pact
2. NATO
3. United Nations
4. United States Department of Defense
5. Marshall Plan
6. S.E.A.T.O.
7. C.I.A.
One problem is by trading by sea, ships are bring invaise sea creatures to other countries and can harm the wild life for other marine ecosystems and for tons of people.