The Act for the Abolition of the Slave Trade, or as it is known the Slave Trade Act 1807, was meant to end slave trade that got its slaves from Africa (D).
Since this was mainly the only place from which slaves were bought, Africa is directly named in the document as the means to end all slave trade.
However, contrary to these expectations, the act did not abolish slavery in English soil. It was thought that by abolishing slave trade, slavery would naturally end. That didn't happen until 1833 with the Slavery Abolition Act that directly abolished slavery in all English soil.