Answer:
community relates to volunteerism because by volunteering you are connecting with your community and making a good impact on it.
welfare relates to volunteerism because by helping those you are bringing them happiness and health especially if you volunteer in a nursing or medical area or a third world country.
The word volunteerism is related to how the government runs, mainly the extent and ways in which it lets peoe make uncompensated donations of money and labor to some form of collective activity or shared purpose. (not too sure about this one sorry). Hopefully this helps :)
