Concept:Non-alignment policy was Nigeria’s key diplomatic shield during the Cold War.Explanation:In the 1960s, the East and West blocs pressured young nations to take sides.Nigeria refused to join either the capitalist camp or the communist camp.Instead, it adopted a non-alignment policy to protect its sovereignty.This allowed Nigeria to relate with both the United States and the Soviet Union without being drawn into their rivalry.The anti-apartheid stance and African centrepiece were important, but non-alignment directly addressed the East-West Cold War.Answer:D. Non-alignment policy