A brand wants to amplify an existing content producer's organic video as an ad. Which feature allows them to do this?

Creator partnerships boost is the correct feature because it allows advertisers to amplify existing organic YouTube content from creators as ads. This is particularly useful for brands looking to leverage authentic creator content for their campaigns. Manual placement is a targeting option, not a feature for amplifying organic content. A Search Lift study measures the impact of ads on search behavior, which is unrelated to amplifying creator content. Keyword targeting is a method for reaching specific audiences based on their search queries or content consumption, not for boosting organic videos.