When Nigeria achieved full independence in 1960, they had already established a federal political structure consisting of three regions based on the three major population clusters that were in its borders.
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Athey had already established a federal political structure consisting of three regions based on the three major population clusters that were in
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Bthey already had established a federal political structure consisting of three regions that was based on the three major population clusters inside
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Cthey already had established a federal political structure that consisted of three regions based on the three major population clusters in
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Dit had already established a federal political structure that consisted of three regions based on the three major population clusters within
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Eit already had established a federal political structure consisting of three regions being based on the three major population clusters it had within
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正确答案: D