Which of These Was an Effect of Slavery in Africa?​

Which of these was an effect of slavery in Africa?​

A) There was an increase in polygamy as a result of the reduction of the male population.
B) African leaders involved in the trade became increasingly violent, oppressive, and militarized.
C) There was a reduction in the general population of Africa.
D) Millions of people were displaced.
E) All of these are correct.