• 6 months
• 90 days
• 12.5 months

The correct answer is: 12.5 months

Explanation: Amazon Marketing Cloud (AMC) stores event-level signals (such as ad impressions, clicks, and conversions from various ad products like Sponsored Brands and Sponsored TV) for up to 12.5 months. This extended data window allows advertisers to perform cross-media custom attribution analyses and gain a deeper understanding of the customer journey over a longer period.

Reference URL: https://advertising.amazon.com/resources/whats-new/sponsored-brands-signals-amazon-marketing-cloud