Answer:
(D)by discussing the presence of the disease where enslaved people originated
Step-by-step explanation:
The text discusses that smallpox originated in agricultural settlements in Africa. What can establish a connection with the slave trade, since during this historical period it was common for Europeans to go to Africa to buy slaves that would be taken to America. In addition, people were brought from Africa to America all the time, which may justify the spread of the disease on the American and European continents.