I would say "hangs" is correct because the subject is "group" and it is a single object. Strangely, "group of X" may take either a singular or plural form of the verb. Here is an article on that.
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I would say "hangs" is correct because the subject is "group" and it is a single object.
Strangely, "group of X" may take either a singular or plural form of the verb. Here is an article on that.
https://brians.wsu.edu/2016/05/19/group-plural-vs-singular/
You have to decid