Posted by John on Tuesday, September 1, 2009 at 6:24am.
#1 is right if there are three or more activities or maybe an unknown number of activities.
#2 is right if there are only two activities (no other number!).
"Which are" is correct since you're referring to "activities" (plural).
3 - 5 are all about the same, yes.
You would use "Which is" if you want to choose just one.
If you may choose more than one, you would use "which are".
3-5 all mean the same thing and all are used.
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