What method applies adjustment evenly across selected cells?

The method that applies adjustments evenly across selected cells is proportional adjustment. This approach ensures that any changes made to a dataset are distributed equally among all selected cells, thus maintaining the overall structure of the data while still allowing for the necessary modifications. By utilizing proportional adjustment, users can easily manage and update their data without skewing the relationships or proportions that exist between the different entries.

In contrast, the other methods mentioned imply different styles of adjustment. Even adjustment could suggest applying the same value to each cell, but it does not clearly define an equal percentage of overall changes across the selected data. Increment adjustment refers to applying a specific additive change to each selected cell, which does not maintain proportionality. Breakback patterns relate to analyzing trends and might involve redistributing totals but do not inherently suggest an even application across selected cells like proportional adjustment does.