What should be attached to the tax return to explain various types of income, deductions, and credits?

When preparing a tax return, it is essential to attach a comprehensive explanation of the various types of income, deductions, and credits. The correct choice highlights the importance of statements as they typically outline detailed information regarding the taxpayer's financial activities and circumstances throughout the year.

Statements can include forms such as W-2s, 1099s, or documentation that justifies claimed deductions and credits. These documents provide a clear and concise breakdown of income sources, expenses, and entitlements, making it easier for the IRS to review and verify the accuracy of the reported information on the tax return.

While worksheets can assist in calculating figures and assessing eligibility for deductions, they do not serve as formal documentation submitted with the return. Invoices are often related to billing and payment records and aren't typically required unless they support a specific deduction but don't provide comprehensive explanations. Supporting documents, while crucial, is a broader category that encompasses various forms including statements, so the most precise answer in this context is statements, as they directly address the need for clear communication regarding the items on the return.