Hi !!
I would answer ► 2, 3, 4
II- Folk culture from once isolated regions can be diffused to other regions of the world.
III- Pop culture threatens to eradicate folk culture as groups abandon traditions in favor of a common culture.
IV- So folk culture have les and less influence than ever before.
Which is not so in countries less "developed" industrial countries where traditions are still very important. Of course, they do not have modern communication, but their traditions aren't disappearing.
I, II and IV are available ... otherwise, that's what I would have said !!
or I and just IV .....
hope this is correct and helpful ☺☺☺