Triads are generally more stable than dyads because:

In group dynamics, a triad is more stable than a dyad mainly because the presence of a third person can diffuse the intensity of interactions between the other two individuals. In a dyad, the relationship is one-on-one, meaning that both parties are directly engaged with each other. This can lead to heightened emotional tension and pressure, as both individuals must navigate their relationship without any external support.

When a third party is introduced in a triad, this third member can provide additional social support, bring a different viewpoint, or mediate conflicts. As a result, the interpersonal dynamics become less fraught, and individuals in the triad may experience a reduction in pressure since they do not have to solely rely on one another for emotional feedback and connection. This creates a more stable environment where disagreements may be less likely to escalate into conflict.

The other options describe various aspects of group dynamics but do not capture the specific reason for the increased stability of triads over dyads as accurately. For instance, while having more perspectives can be beneficial, the key factor is how a third person alleviates some of the relational pressure between the other two individuals.