help plz can someone tell me what I did wrong???

Which of the following was a result of the reconstruction act of 1867? check all of the boxes that apply.

What do you think was a drawback to this method of calculating distance

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.