Which form does a person complete to demonstrate his or her legal ability to work and pay taxes on income?A.1040B.W-2C.W-4D.I-9

To demonstrate a person's legal ability to work and pay taxes on income, the appropriate form to complete is D. I-9.

The I-9 form, officially known as the Employment Eligibility Verification form, is used in the United States to verify an employee's identity and their legal authorization to work in the country. Employers are required to have their employees complete this form on or before their first day of employment.

In contrast:

• A. 1040 is an individual income tax return form used to report personal income and calculate taxes owed.
• B. W-2 is a wage and tax statement that an employer provides to employees to report their annual wages and the taxes withheld.
• C. W-4 is a form that employees fill out to indicate their tax withholding preferences.

Thus, the correct answer is D. I-9.