Final answer:
Social Security disability benefits are calculated based on the worker's Primary Insurance Amount (PIA), which is calculated from their Average Indexed Monthly Earnings over their highest 35 years of work. So, the correct answer is option b.
Step-by-step explanation:
Social Security disability benefits are calculated based on the worker's Primary Insurance Amount (PIA), which is calculated from their Average Indexed Monthly Earnings over their highest 35 years of work. The PIA takes into account the worker's earnings history and applies a formula to determine the benefit amount. It is important to note that the benefit amount is subject to annual cost-of-living adjustments. So, the correct answer is option b.