You Are Walking Across Campus and See a Large Group

You are walking across campus and see a large group of students gathered outside the student union listening to someone talk. You stop and try to listen, but you can't get close enough. You ask another member of the crowd what's happening, and you are told that someone was proselytizing and that some students gathered to listen while others argued. What does this tell you about crowds?

A) A crowd doesn't have to share a geographic location.
B) In any crowd, people have many different motivations.
C) Crowds are illogical.
D) When people join a crowd, they lose their individuality and become part of something like a collective mind.
E) Crowds tend to form for mostly benevolent purposes.