It's really an opinion question from your perspective of terrorism.
One movement that came to mind for me was the “Black Lives Matter” group and movement. The moment that group was created the government and F.B.I. thought of it as them becoming a security threat. I believe formations of those groups shouldn’t require approval, but rallies or parades should.
D. because Facebook averages about 1.7 billion users everyday!
Hope this helps! Have a wonderful day and good luck! If you need more help, don't be afraid to ask! I'd be happy to assist you!
Can you put this as BRAINLIEST? Thank you so much