I believe the answer is: <span>c. the clancys are experiencing higher levels of marital satisfaction than the mckavicks are.
Based on the research of marital satisfaction, most couple who grow old together to the point when they've acquired grandchildren are typically more satisfied with their marriage compared to younger couples.
This happen because in order to stay together that long, couples need a high compatibility level.</span>
Ruler Zhou of the Zhou dynasty
<span>Growth Mindset: This is when a person believes that their abilities can be developed through dedication and hard work. This was first described by Carol Dweck in her research entitled 'Mindset: The New Psychology of Success'. This is in contrast to those having a Fixed Mindset, where a person believes their abilities are static and cannot change regardless of the effort they put in.</span>
John C. Calhoun--------hope this helps... rate me brainliest