Im bored again. sum1 talk to me. please

Which item best completes the chart?

Prior to the presence of europeans on the continent, the slave trade in africa a) did not exist in any form. b) was limited to internal trade only. c) included the trans-saharan and indian ocean slave trade. d) was rarely needed due to the lack of an agricultural economy.

Which choice describes some of the difficulties john adams faced as presiden