What was a main advantage of the three-field system?
Crops matured at different times.
New types of crops could be grown.
Extra food reduced the chance of famine,
Multiple harvests became commonplace.

answer; /// (c) i do believe that the correct answer is ; an unstated guarantee that goods will be to the consumer's liking;

classical republicanism, also known as civic humanism, is a form of republicanism  developed in the renaissance inspired by the governmental forms and writings of  classical  antiquity, especially such  classical  writers as aristotle, polybius, and cicero.