Which type of tables must be compatible with a workbook's filter for adding assumptions?

Assumption tables must be compatible with a workbook's filter for adding assumptions because they specifically handle and store the various assumptions that might be applied to model inputs or scenarios within the planning process. These tables serve as a foundation for calculating and updating forecasts based on changing conditions or strategic decisions.

Assumption tables are designed to work seamlessly with workbook filters, enabling users to apply specific assumptions to various scenarios without affecting the integrity of the underlying data. This compatibility ensures that the assumptions are easily adjustable at any time, providing flexibility in simulation and analysis.

While reference tables, data tables, and calculative tables are important in the broader context of data management and analysis, they do not specifically hold the assumptions that drive the calculations within the model in the same way that assumption tables do. Therefore, the correct answer highlights the critical role that assumption tables play in managing the assumptions that influence outcomes in a planning scenario.