The appropriate conclusion drawn from the passage about how Confucianism influenced the social class system between Zhou rulers and their subjects is:
Rulers understood that peasant farmers had to be treated respectfully so that they could produce enough food to feed the general population.
This conclusion aligns with the emphasis in the passage on reverence, trustworthiness, and the importance of treating fellow men with care, as well as the idea of employing the labor of common people at the right times to ensure a stable food supply.