Answer:
C.
Jonas Salk developed a vaccine that provided protection against the feared disease polio.
Step-by-step explanation:
The passage is about how the disease polio was killing thousands of people, and Salk studied and tested a vaccine for polio. He gave out the cure to a few million kids, and it was effective. He became a hero and was given an award from President Dwight D. Eisenhower.
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