What Is Significant About Sir John A

What is significant about Sir John A. Macdonald's National Policy of 1879?

A) It solidified Canada's fate as an economically dependent nation.
B) It solidified Canada's identity as a parochial and isolationist country with an internally focused economic plan.
C) It was the only coherent and explicit economic development strategy before the decision to embrace free trade in the late 1980s.
D) It laid the groundwork for Canada's multilateral co-operation with other nations in the areas of national defence and security.
E) It laid the groundwork for Canada's first reciprocity treaty with the US.