GMAT Sentence Correction (SC) | Re: The Olympic Games helped to keep peace among the pugnacious

My 2 cents:
NOTE: Phrases “during the month of the festival” and “for the month of the festival” mean separate things.
“during the month of the festival” – something was done during the month of festival. HERE WE DON’T KNOW WHEN THAT something WILL END!!!

“for the month of the festival” – something was solely done for the duration of festival month. HERE WE DO KNOW WHEN THAT something WILL END!!!

So in options C and E change the meaning of the sentence.

---