Final answer:
Conflict avoidance is not one of John Gottman's key characteristics of a successful relationship; instead, he emphasizes respectful communication, shared meaning, and positive sentiment override.
Step-by-step explanation:
Among the options provided, Conflict avoidance is not one of John Gottman's key characteristics of a successful relationship.
Gottman's research highlights the importance of respectful communication, the creation of shared meaning, and positive sentiment override, where positive thoughts about one's partner and relationship override negative ones. In contrast, conflict avoidance can actually be harmful to a relationship because it prevents issues from being resolved and can lead to resentment over time.