Which is not considered a reason for the stabilization of the divorce rate over the past three decades

This question comes with the following options:

a. Fewer people are marrying at younger ages.

b. Married people are more likely to be educated.

c. Divorce has once again become socially unacceptable.

d. Economic uncertainty and the high cost of obtaining a divorce is

    keeping people together.

The top causes and reasons for divorce still continue to be infidelity, financial struggles, lack of communication, unrealistic expectations, lack of intimacy and abuse in general. Some of those have been tackled throughout the past three decades due people got more educated thus marrying at older ages and being thoughtful about the consequences of it including economic side effects, but divorce is still an answer and a socially viable and realistic solution when situations get unsustainable or reach distressing levels. Thereby from the options above provided the answer would be (c.)