The statements in your picture have nothing to do with divorcing.
* : people who get married
* : married people
* : people who got married (≠ people who finished their marriage)
* : people who were once married (people who have gotten divorced)
is interchangeable with in most cases. focuses more on the current state ("married"), whereas focuses on the past action of getting married. But such difference is not very important at least in the question in your picture.
To take another example, is also a instant change-of-state verb. and are almost always interchangeable. Only in some special contexts the former may mean "people who were resurrected after being once dead".