Based on the information in "Edward Jenner and the History of Smallpox and Vaccination,” how does the author support the claim that the slave trade played a role in the spread of smallpox?
Answer
A
by explaining how smallpox was brought to America
B
by describing how smallpox was used as a weapon in America
C
by suggesting that the disease existed wherever enslaved people traveled
D
by discussing the presence of the disease where enslaved people originated