How should a taxpayer be informed about any changes made to their rejected electronic return by the ERO?

The correct choice emphasizes the importance of transparency and communication in the handling of electronically filed tax returns. When a taxpayer's electronic return is rejected, the Electronic Return Originator (ERO) is responsible for addressing the issues that led to the rejection. It is essential for the ERO to provide the taxpayer with copies of the updated data reflecting any changes made to the return. This communication ensures that the taxpayer is fully informed about the modifications, enabling them to understand the adjustments and reassure them that their return is being properly managed.

Providing copies of updated data also allows the taxpayer to verify that the corrections made by the ERO align with their expectations and maintain clarity throughout the filing process. This practice helps promote trust in the services provided by the ERO and supports compliance with IRS regulations surrounding the electronic filing process.

Other options, such as not informing the taxpayer, only reporting significant changes, or requiring the taxpayer to request this information, do not prioritize the taxpayer's right to be informed, which is crucial for them to be engaged in their tax filing process.