Aggregated empathy maps are useful for identifying what?

Aggregated empathy maps serve as a visual tool that synthesizes insights from various user personas, revealing common themes and patterns among different user segments. By collecting data from multiple sources and users, these maps highlight shared emotions, needs, behaviors, and pain points which help designers understand the collective experience of a group rather than focusing solely on individual perspectives. This understanding can guide design decisions to better meet the collective needs of users, ensuring that the final product resonates with a broader audience.

Exploring the other options provides additional context. Individual design preferences focus on singular users and do not capture the overall user experience. Challenges about the product's usability may be identified, but these are often more specific to individual experiences rather than common themes. Marketing strategies for different demographics depend on market research and segmentation, which is distinct from the insights gained through empathy mapping. Thus, C stands out as the most relevant choice for aggregated empathy maps.