Which group was at the bottom of medieval hierarchy

A period of history between the ancient period and the modern, spanning roughly from 476CE to 1492CE. A simple model used to represent the social structure of the Middle Ages. In this system, there exists a strict hierarchy, with the King at the top and peasants at the bottom.

peasants, we know this because they were hated

example:

Many peasants disliked trial by jury, as they feared that it fostered feelings of revenge among their neighbors and fellow villagers. The brutality of the medieval system of law and order succeeded in preventing many large-scale uprisings. ... Many peasants were forced to work a few days every week on church land for free.

i think the answer is c, rivers.

explanation:

sometimes, borders fall along natural boundaries like rivers or mountain ranges. for example, the boundary between france and spain follows the crest of the pyrenees mountains. for part of its length, the boundary between the united states and mexico follows a river called the rio grande. the borders of four countries divide africa’s lake chad: niger, chad, cameroon, and nigeria.