According to Passage 2, which of the following are true of the smallpox outbreak in Boston during the Revolutionary War?
a. It ended in 1781.
b. It was successfully fought through inoculation.
c. It could be carried by people who did not show symptoms of the virus.
d. It no longer had an impact on Washington's army after around 1778.
e. It was not planted intentionally by the British.
f. b, c, and d
