Amazon DSP supports creation of lookalike audiences from:

Amazon DSP offers robust lookalike audience creation capabilities, allowing advertisers to expand their reach to new customers who share characteristics with their existing high-value segments. This functionality is supported across various audience types. You can create lookalike audiences from hashed audiences, which are privacy-safe, encrypted customer lists. It also supports lookalikes based on simple pixel or Amazon Advertising tag events, such as website visits or product views, capturing behavioral signals. Furthermore, audiences transferred from Data Management Platforms (DMPs) can also serve as a source for lookalike modeling, leveraging richer, third-party data. Therefore, "All of the above" is the correct answer as Amazon DSP integrates these diverse data sources for lookalike generation.