Where did you find out about our volunteer program?

"I heard your CEO speak at a networking event and the organization sounded like a perfect fit, so I've been keeping my eye open for a volunteer opportunity here."

The interviewer would like to know what methods and resources you used to search for volunteer opportunities so they can determine which of their methods is working best. You can expand your answer to include any other exposure you have had to the organization.

"I initially saw your posting on LinkedIn. However, I have been exposed to your organization many times before through your radio commercials and advertisements on Facebook."