The Assize of Bread, established during King John of England's reign in the early 1200s, primarily helped shape food regulations by addressing the quality and pricing of bread. Therefore, the most relevant option from those provided is:
It required bakers to offer their bread at an affordable price.
This regulation aimed to ensure that bread, a staple food for the population, was available to the public at a fair price, thereby protecting consumers from price gouging and ensuring food security in the community. Additionally, the Assize also set standards for the weight of loaves, contributing to overall food regulation practices of that era.