What was the most significant bonding factor for the diverse groups of Africans brought to the mainland colonies?

A) religion
B) race
C) language
D) slavery
E) culture

The most significant bonding factor for the diverse groups of Africans brought to the mainland colonies was slavery. They were all forcibly taken from their homes and brought to the colonies as slaves, which created a common experience and identity among them. While they may have come from different cultures, religions, and languages, they were all subjected to the same system of oppression and exploitation, which created a shared sense of struggle and resistance. Therefore, slavery was the most significant binding factor for these diverse groups of Africans.