Why were the African Nations so weak during the Age of Imperialism? Why couldn't they stop European colonization?

There were several negatives of colonialism for the Africans like resource depletion, labor exploitation, unfair taxation, lack of industrialization, dependence on cash crop economy, prohibition of trade, the breaking up of traditional African society and values, lack of political development, and ethnic rivals inside

Some European attempts to colonize the New World failed not only because of physical hardships and deprivation but also because of cultural misunderstandings on the part of both the colonizers and the native inhabitants.

the answer to that question is d. Gold.