Which type of relationship is characterized by members supplying what others lack?

The correct choice is complementary relationships, which are defined by each member providing what the other lacks, creating a balance that enhances the overall dynamic of the relationship. For instance, in a complementary relationship, one partner may be strong in areas where the other is weak, such as one partner being very assertive while the other is more passive. This complementarity can lead to greater effectiveness in achieving goals, as each person's strengths compensate for the other's weaknesses.

In contrast, symmetrical relationships are characterized by equality where both parties exhibit similar behaviors and power dynamics, leading to a more balanced interaction without the compensatory aspect. Interpersonal relationships is a broader term that doesn't specifically denote the nature of the exchanges between members. Competitive relationships, on the other hand, emphasize rivalry and conflict rather than cooperation and complementarity, focusing on opposing interests rather than support. Therefore, the unique characteristic of a complementary relationship is the supply of missing qualities by each member, enabling a more supportive and cohesive interaction.