What is required to attach when filing Form 3800 regarding business credits?

When filing Form 3800, which is used to claim various business tax credits, attaching comprehensive documentation is essential. The requirement to include a statement that shows the tax year the credit originated is crucial for establishing the credit's applicability and historical context. This helps the IRS understand the timeline and eligibility of the claimed credit. Additionally, detailing the amount of the credit reported on the original return provides transparency and helps verify the amounts claimed, ensuring they align with previous filings. Furthermore, stating the amount of the credit allowed for the current year is necessary to clarify what you are claiming and to assist in the IRS's verification process.

Including all these elements together promotes clarity and accuracy in the filing, which can help prevent errors and potential disputes with the IRS. By attaching all the requested information, filers ensure a smooth review process for their claimed credits and align with IRS requirements. This comprehensive approach is why the selection encompassing all these components is the correct answer.