Which of the following is a good example of community service

C, assisting the elderly. 

Part-time jobs aren't considered community service, as you're getting paid for it. More often then not, its not considered community service if you're being paid. Assisting the elderly is a good example of community service as its without pay, and you're chipping in work.

Dropping a dry bar of soap on the ground won’t clean it, by it will pick up germs from the ground so the soap would be dirty

The answer would be c (set)hope this ! (: