Which statement best summarizes the section "A Human Chain"?
A. Twenty-two orphaned boys who had never had smallpox became a "human chain" as they crossed the ocean.
B. Many people in Latin America were vaccinated and saved from smallpox due to a "human chain" of boys who were infected with cowpox.
C. A far-reaching vaccination program during the years 1803–1807 helped to prevent many people from getting smallpox.
D. Because of a successful worldwide program to wipe out smallpox forever, there has been no recorded case of it since 1979.
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Which statement best summarizes the section "A Human Chain"?
A. Twenty-two orphaned boys who had ne...
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