The answer is C, "Dr. Jonas Salk, a medical researcher from New York, developed the first effective polio vaccine."
Explanation:
The other answers are not punctuated correctly. The first one should have a comma after "piece", the third one should have a comma after "class", and the fourth one shouldn't have a comma at all.
Option F would be the best answer, personal narratives should be concluded with with an outcome of the experience and a reflection on what you've learned.
