Concept:Foreign involvement in the Nigerian Civil War shaped the outcome.
Explanation:Biafra sought international support for its secession from Nigeria.
Great Britain and the Soviet Union backed the Nigerian federal government.
The United States remained officially neutral.
France, however, expressed moral support for Biafra’s right to self-determination.
Beyond moral encouragement, France provided financial and material assistance to Biafra.
This made France the major power that openly favored Biafra’s cause during the war.
Answer:France (Option C).