Parental well-being is harmed when they believe their grown children should be ______.

A) living at home
B) taking care of them
C) more dependent
D) more autonomous

When parents believe their grown children should be more autonomous, they may struggle with feelings of disappointment or a sense of failure as a parent if their children have not achieved certain milestones. This can lead to lower levels of parental well-being. Conversely, when parents believe their grown children should be more dependent, they may experience higher levels of stress and burden, which can also lower their well-being. Therefore, the best choice is D - more autonomous.