GRE Reading Comprehension: ETS-GRE阅读ETS - VTGJLD15GB1RMX4T7

According to the passage, all of the following are true of the West African rules governing marriage: A. The rules forbade marriages between close kin. B. The rules were not uniform in all respects from one West African tribe to another. C. The rules have been considered to be a possible source of slaves' marriage preferences.