The best answer is:
A) Tarzan's encounter with the villagers of Mbonga is a turning point, as it exposes him to human civilization and a different way of life and challenges his understanding of human behavior.
This encounter is significant because it serves as a crucial moment in Tarzan's journey towards understanding his own identity and the complexities of human society, enabling him to reconcile his dual upbringing in the jungle and the insights gained from human interactions.