Read the text below and identify its main idea:
"Many people believe that doing favors is simply an act of kindness. However, sociological studies suggest that favors play a crucial role in building and maintaining social networks. When individuals exchange favors, it creates a sense of mutual obligation and trust, making the community more resilient and cooperative. This reciprocal behavior is a cornerstone of human interaction."
A) Favors are essential for building strong communities and social networks.
B) Sociological studies confirm the kindness of favors.
C) Favors are only about mutual obligation and not kindness.
D) Reciprocity is a secondary aspect of doing favors.
E) People do favors only to get something in return.