Answer:
C) reciprocity
Step-by-step explanation:
Based on the scenario being described within the question it can be said that this success can be best attributed to the aspect of reciprocity. This term refers to the social norm of responding to an action with another similar action. In the Amish egalitarian society all individuals are born equal and help each other, thus one receives help and is more inclined to offer help back, and so forth.