Which widget is needed inside of a List View for visualizing a dynamic image?

The Image Viewer widget is specifically designed for displaying images in Mendix applications, making it the best choice for visualizing a dynamic image within a List View. This widget is capable of handling dynamic data, allowing images to be sourced from various locations, such as a database or external URLs.

It provides the necessary functionality to display images clearly and efficiently, ensuring that users have a seamless experience interacting with dynamic content. The Image Viewer can adapt to different image formats and sizes, making it a versatile tool for presenting graphical elements.

In contrast, other options like Photo Album and Thumbnail Gallery are intended for different use cases, such as presenting collections of images rather than focusing on individual dynamic images. The Dynamic Image Box may also seem relevant, but it's more suited for scenarios needing specific styling or functionality that goes beyond the straightforward features of the Image Viewer. Hence, the Image Viewer is the most appropriate choice for this scenario.