Final answer:
The thematic lines of agency in love, intimacy, and belongingness contribute to individuals' sense of personal involvement, purpose, belonging, responsibility, challenge, comradeship, and love. Sternberg's triangular theory of love describes different types of love based on combinations of intimacy, passion, and commitment.
Step-by-step explanation:
The thematic lines of agency are love, intimacy, and belongingness, which contribute to individuals' sense of personal involvement, purpose, belonging, responsibility, challenge, comradeship, and love. In Sternberg's triangular theory of love, different aspects of love are described, such as consummate love, liking, infatuation, empty love, companionate love, romantic love, and fatuous love. Each of these types of love represents different combinations of intimacy, passion, and commitment in relationships.