Final answer:
Including volunteer experience on a separate sheet is the best way to include it on an employment application. Therefore, the correct option is C.
Step-by-step explanation:
The best place to include volunteer experience on an employment application is option C - it should be listed on a separate sheet. Since there is no specific place to list volunteer experience on the application, creating a separate sheet allows you to provide detailed information about your volunteer work without cluttering the main application form. This separate sheet can be attached to the application.