Which Statement Describes the Difference Between Ethnic Rotation and Federal

Which statement describes the difference between ethnic rotation and federal character ?

A) The former refers to a practice of rotating political offices among the different ethnic groups whereas the latter refers to the federal structures of the country.
B) The former refers to a practice of rotating political offices among the different ethnic groups whereas the latter refers to the practice of rotating federal political offices among the different states.
C) The former has never been violated whereas the latter threatens to be violated by President Jonathan's decision to run for reelection.
D) The former refers to a practice of rotating political offices among the different ethnic groups whereas the latter refers to the setting aside of ethnic quotas in government hiring practices.
E) The former is codified in the constitution whereas the latter is not.