Respuesta :
Answer:
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The correct answer is D
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Explanation:
Jonas Edward Salk (October 28, 1914 – June 23, 1995) was an American medical researcher and virologist. He discovered and developed one of the first successful polio vaccines.
Answer: D) developing the first vaccine for polio.
Explanation: Jonas Salk is important for developing the first vaccine for polio. In the 1950s it caused the number of reported polio cases to drop by nearly 90%, and has since helped to virtually eradicate the disease that crippled millions (including President Franklin Roosevelt).