Final answer:
The slave trade's lasting impact is evidenced by the fact that the areas from which the most enslaved people were taken are now the poorest in Africa.
Step-by-step explanation:
The sentence from the text that supports the idea that slavery affects people today is: 'One scholar has demonstrated that the areas from which the most enslaved people were taken are today the poorest in Africa, though at the time of the slave trade they were among the most developed.' This sentence shows that the regions heavily affected by the slave trade continue to suffer from poverty, indicating a lasting impact.