What is judged based on a creator's ability to engage the audience's interest?

Viewer Interest is the correct choice because it specifically pertains to how effectively the creator captures and maintains the attention of the audience throughout the Public Service Announcement (PSA). Engagement is critical for conveying the message and ensuring that the intended information resonates with viewers. A PSA that successfully piques audience interest is more likely to be remembered and acted upon, fulfilling its intended purpose.

Filming Quality, while important, primarily focuses on the technical aspects such as clarity, sound, and visual appeal, rather than directly addressing how well the content engages the audience. Script Length could impact viewer attention if excessively long, but it does not inherently measure interest. Topic Relevance ensures that the subject matter aligns with the audience's experiences or concerns but doesn’t necessarily engage them; a relevant topic can still be presented in a way that fails to capture interest. Thus, while all the other options are elements of a PSA, Viewer Interest is specifically about how engaging the presentation is.