Which statements support the claim that Jenner has been given credit for starting and spreading the practice of immunization?

A and E support the claim because they describe Jenner learning about cowpox’s protective effects and hearing that it could prevent smallpox. C also supports it by saying Jenner took the first step toward eradicating smallpox. B names his mentor but does not show how he started or spread immunization, and D only describes smallpox’s severity.

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