Final answer:
The dimension of love emphasized in Carla and Steve's relationship, according to Sternberg's triangular theory of love, is 'commitment'. This is because Carla intends to maintain the relationship and believes that Steve will stand by her, which aligns with the theory's commitment component.
Step-by-step explanation:
According to Robert J. Sternberg's triarchic theory of love, the scenario described emphasizes the dimension of commitment. Carla has appraised their relationship positively and is determined to maintain it through problems, believing that Steve reciprocates this sentiment and will stand by her. This aspect of their relationship aligns with the commitment component of Sternberg's triangular theory of love, which is defined by the decision to maintain a loving relationship and the effort to stand by this commitment in sickness and health.
In the broader context of Sternberg's theory, commitment is just one of the three components that define love, with the other two being intimacy (the sharing of intimate thoughts and emotions) and passion (physical attraction and romance). The theory proposes that different combinations of these components result in different types of love, such as consummate love (which includes all three components), companionate love (intimacy and commitment, but no passion), and romantic love (passion and intimacy, but no commitment).
Therefore, the type of love Carla and Steve share, as described in the scenario, where commitment is prominently featured, could potentially evolve towards consummate love if passion and intimacy are also well-established in their relationship.