A group of people who

Tanya Carousel

Senior Member
Hello. In the Laser Workbook there is a task where you must put an article.
And there is a sentence, "The films tell the story of  a group of quite ordinary people who want to be policemen but have trouble with the cruel officer who wants to stop them".
After the phrase "a group of quite ordinary people" there goes the word "who" with the further clarification.
I wrote " a" before the word "group" because in the Key answers, before the word "group" the answer is "a".
Could you, tell me, please, why here the article "a" is used (instead of "the")?
Thanks in advance!
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