Final answer:
Broadcasters must devote a specific amount of free airtime to nonprofit organizations, a publicity tool known as public service announcements (PSAs).
Step-by-step explanation:
The correct answer to the question is c) Public service announcements (PSAs).
Broadcasters must devote a specific amount of free airtime to nonprofit organizations as a publicity tool known as public service announcements (PSAs). PSAs are announcements that are intended to serve the public interest by raising awareness about important social issues, promoting community events, and providing information about nonprofit organizations and their initiatives.
PSAs are different from commercial advertising, which involves paid advertisements for commercial products or services. Fundraising and sponsorship programs are also separate concepts, not specifically related to broadcasters devoting free airtime to nonprofit organizations.