Final answer:
The Slide Sorter View allows for easy rearrangement of all files contained in a presentation by displaying thumbnails of all slides which can be reorganized through drag and drop.
Step-by-step explanation:
The option that allows all files contained in the presentation to be easily rearranged is A. Slide Sorter View. This view provides a thumbnail display of all the slides in the presentation, which makes it easy to see the overall structure and sequence. You can simply drag and drop the slides into a different order or select multiple slides to move or delete. Other views such as Outline View, Slide Show View, and Normal View have different purposes and do not offer the same ease of reorganizing slides as the Slide Sorter View.