What allows users to reuse common expressions in a worksheet?

The option regarding the use of calculated expressions based on values is correct because it highlights a fundamental aspect of worksheet functionality. Calculated expressions enable users to create complex formulas by reusing existing expressions or calculations within the worksheet. This promotes efficiency, as users don’t have to redefine calculations each time they need to perform similar operations; instead, they can reference these expressions wherever necessary.

This approach enhances consistency in calculations and reduces the risk of errors, as the same expression will yield the same result throughout the worksheet. Additionally, it allows for easier updates—if a calculation needs to be adjusted, the change can be made in one place, and all references to that expression will automatically reflect the change.

The other options do not directly address the reuse of expressions in the same meaningful way. Direct editing of fields does not inherently support the reuse of expressions, as it focuses more on modifying individual data points. Referencing external documents typically involves pulling in data or formulas from another source rather than reusing expressions within the same worksheet. Lastly, while improving overall performance of the worksheet is beneficial, it does not specifically relate to the concept of reusing expressions. Therefore, calculated expressions based on values present the most accurate understanding of how users can effectively utilize common calculations within their worksheets.