Which of the following pieces of information would be most useful in determining whether the conclusion is valid for an individual worker? A. The amount of money the worker will contribute to the retirement plan over his or her career. B. The amount that tax rates will increase in the future. C. Whether or not inflation will be lower than the retirement account's annual earnings. D. How the worker's tax bracket in retirement compares to his or her tax bracket while still employed. E. The dollar value of the worker's account upon retirement.