Which of the following is true regarding children’s health insurance under the ACA?

The statement that children must remain on their parent's plan until age 26 is true under the Affordable Care Act (ACA). This provision is part of the ACA's broader aim to extend healthcare coverage and ensure that young adults have access to health insurance, recognizing that many young adults may still be financially dependent on their parents while pursuing education or entering the workforce.

The ACA specifies that parents can keep their children on their health insurance plan until they reach the age of 26, regardless of whether the child is living with the parent, is financially dependent on them, or is eligible to enroll in their employer's health plan. This has provided essential healthcare security for many young adults transitioning to adulthood.

Other options do not hold true as per the ACA's stipulations regarding children’s health insurance. For instance, children cannot be denied coverage due to pre-existing conditions, which is a significant protection ensured by the ACA, and they are indeed eligible for coverage under various ACA provisions. Therefore, the assertion that children’s coverage options have decreased goes against the provisions established by the ACA, which aimed to expand coverage and improve access to healthcare services.