Answer:
B. The slave trade was banned in Britain and all of its colonies.
Step-by-step explanation:
Beginning in the early 1800s, European nations slowly outlawed the slave trade, though it took years to end. Arab and African slave traders continued to seize people from Central and East Africa to work as slaves in the Middle East and Asia well into the 1800s. Thus the demand for slaves remained and the slave trade continued in Africa. As reports of this slave trade spread, abolitionists and European explorers demanded action to end it.