Li is an Amazon.com seller and is getting ready to launch a new product on Amazon.com. Which tool or feature can they use to learn more about their customers?

Amazon Insights is the correct answer because it provides valuable data and analytics about customer behavior, preferences, and trends, helping sellers like Li better understand their target audience. Amazon Insights allows sellers to access information about their customers' shopping patterns, purchasing behavior, and other key metrics that can inform product development, marketing strategies, and sales forecasting. By utilizing this tool, Li can gain a deeper understanding of what customers are looking for, allowing them to tailor their product launch to meet customer demand more effectively. The Product Opportunity Explorer focuses on identifying potential product ideas, and Amazon Vine is a review program, so neither of those is directly focused on customer insights.