Final answer:
A characteristic of a healthy marital relationship that promotes well-being is positive affect.
Step-by-step explanation:
A characteristic of a healthy marital relationship that promotes well-being is positive affect. Positive affect refers to the presence of positive emotions, such as happiness, joy, and love, in the relationship. When couples experience positive emotions, it enhances their overall well-being and strengthens their bond.
On the other hand, options B, C, and D are not characteristics of a healthy marital relationship that promote well-being. High financial status, while important for financial stability, does not guarantee a healthy relationship. Frequent arguments and marital isolation can lead to relationship distress and negatively impact well-being.
In summary, positive affect is a key characteristic of a healthy marital relationship that promotes well-being.