Final answer:
Gottman's principle determining a marriage's success revolves around communication style, though financial stability also plays a role by affecting shared responsibilities and stress levels within a marriage.
Step-by-step explanation:
According to Gottman, the principle that determines whether a marriage will work or not is a. Communication style. While financial status does impact marital stability, it is the way couples interact and solve conflicts that is a fundamental aspect of Gottman's principles for a working marriage. This includes engaging in constructive dialogue, showing empathy, and expressing mutual respect. Other factors associated with a couple's financial status include shared responsibilities, power dynamics, and stress levels within the relationship. Gottman's research suggests that other elements such as shared values, emotional connection, and a good conflict resolution method are also significant for a stable partnership.