Which of the following is a provision of the Affordable Care Act (ACA)?

The provision that allows young adults to remain on their parent's health insurance plan until the age of 26 is a significant aspect of the Affordable Care Act (ACA). This provision aims to provide greater access to health insurance for young adults, who often transition from schooling to the workforce and may find it challenging to obtain affordable insurance on their own. By allowing coverage to extend until age 26, the ACA helps to reduce uninsurance rates among young adults, offering them a safety net during a crucial period in their lives when they may have unstable employment or income.

The other options reflect regulations that are not part of the ACA. For instance, the ACA specifically prohibits insurance companies from denying coverage due to pre-existing conditions, whereas the other options, like imposing lifetime limits on benefits or charging differently based on gender, are contrary to the protective measures introduced by the ACA, which aims to promote fairness and access in healthcare coverage.