Respuesta :
It shows that it is always better to work with people you don't know well instead of your friends.
The correct option is D. It shows that it is always better to work with people you don't know well instead of your friends.
What is an idiom?
A phrase in a language's usage that is unique to itself, either in the meaning it conveys that cannot be inferred from the conjoined meanings of its constituents or in the grammatically unusual way it uses words.
Thus, By showing that it is always better to work with people you don't know well instead of your friends that role of the idiom in the passage. A common term or saying that has a metaphorical meaning in addition to its literal meaning is referred to as an idiom.
Learn more about Idiom here:
https://brainly.com/question/6674805
#SPJ2