An advertiser wants to drive awareness about a new product launch to people on Pinterest who saved its Pins previously. Which type of audience targeting should be used?

An Engagement audience is the correct choice because it allows you to target users who have previously interacted with your content on Pinterest, such as saving (Pinning) your Pins. This directly addresses the advertiser's goal of reaching people who have already shown interest in their brand by saving their Pins. Actalike audiences (also known as Lookalike audiences) are used to find new users who share similar characteristics with an existing audience, not to re-engage previous interactors. Site visitor audiences target users who have visited your website, which isn't specified as the primary interaction here. Customer list audiences involve uploading a list of existing customer emails or IDs, which is different from targeting based on in-platform engagement.