Answer:
Fundraising
Step-by-step explanation:
"Education," "Environmental," and "Campaigning" are all causes and the ways on which some people can volunteer to support goals.
Fundraising is another one that is very common; people make volunteer fundraisers quite frequently to get the money needed for some good and valuable goal.
While teamwork, friendship, and exercising are also connected with volunteer work, they are connected on a different level.
Friendship and exercising are connected as personal things people gain from this type of activity and something to make their volunteering experience better, while teamwork is something that is important for a good group volunteer experience.