What is the significance of defining filter expressions for a list variable?

Defining filter expressions for a list variable is significant because it allows the user to limit the values displayed, effectively narrowing down the data to only what is relevant for their needs at that moment. By setting specific criteria through filters, users can manage and control the information they interact with, ensuring that they are not overwhelmed by unnecessary data. This streamlined approach facilitates a more efficient analysis and decision-making process as users can focus on pertinent values without distraction from irrelevant or extraneous options.

The other options, while related to data handling, do not accurately capture the primary purpose of using filter expressions for list variables. For instance, increasing the number of displayed values contradicts the purpose of applying filters, which is to reduce the visible data set. Eliminating data redundancy and enhancing workbook load speed are not direct outcomes of defining filter expressions; instead, filtering is primarily about improving user experience through targeted data presentation.