Answer :
In the sentence provided, the list of events that Photographer Margaret Bourke-White covered is not punctuated correctly. To properly punctuate a list, commas are used to separate three or more items in a series.
The corrected sentence would be:
"Photographer Margaret Bourke-White covered some of the most important events in history: the German invasion of the Soviet Union, the liberation of Buchenwald Concentration Camp, and Mahatma Gandhi's hunger strikes for peace in India."
By adding a colon before the list, it signals to the reader that a series of items will follow. Then, using commas to separate the events makes the list clear and easy to understand.
