Which example illustrates combined long-term memory encoding strategies of visual imagery and organization?

The choice that illustrates combined long-term memory encoding strategies of visual imagery and organization is indeed when a person imagines each fish on a tree structure corresponding to categories. This method utilizes visual imagery by creating mental representations of the fish and their corresponding categories, allowing for a more vivid and memorable encoding experience.

In addition to visual imagery, the use of a tree structure organizes the information hierarchically, which aids in retrieval by providing a clear visual schema. This technique is effective because it combines both the visual aspect of remembering images and the organizational aspect of categorizing information, which enhances understanding and recall.

The other options do not combine both of these strategies effectively. Listing fish in alphabetical order does involve organization but lacks the visual imagery component. Focusing on auditory repetition primarily involves encoding through hearing without utilizing visual strategies. Watching a video provides visual information but does not engage the active mental imagery or organization that is critical for long-term memory encoding in the way that the tree structure does.