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.
(A) they had already established a federal political structure consisting of three regions based on the three major population clusters that were in - Nigeria is singular and usage of the pronoun 'they' is incorrect
(B) they already had established a federal political structure consisting
...
(A) they had already established a federal political structure consisting of three regions based on the three major population clusters that were in - Nigeria is singular and usage of the pronoun 'they' is incorrect
(B) they already had established a federal political structure consisting
...
.jpg)
