The greek chorus select all that apply.

functioned as a commentator on the action
was made up of professional actors
often took the role of an anonymous crowd
often represented the opinions of the general populace

I may not know the answer fully but just to help a bit, one of your selections is: B) was made up of professional actors. Choruses were comprised of actors only so the second option would be one. But another one from my own guessing is C) often took the role of an anonymous crowd. Do not get mad at me if one of them is wrong. But you should read a bit more about what you are learning then if you do not know ask . 

Hope this helped! <3