A demand schedule is best defined as:

A demand schedule is accurately defined as a table showing the relationship between price and quantity demanded. This table effectively illustrates how the quantity demanded of a good or service varies as the price changes, holding all other factors constant. It is a fundamental concept in economics that helps to understand consumer behavior in response to price fluctuations. By presenting this information in a tabular format, it allows economists and businesses to analyze demand patterns and make informed pricing decisions.

Other options, such as a graph representing demand over time or a document detailing consumer preferences, do not capture the specific function of a demand schedule. While these might provide useful information in specific contexts, they do not reflect the direct relationship between price and quantity demanded that a demand schedule neatly encapsulates. Moreover, a list of prices and their corresponding quantities supplied pertains to supply schedules, not demand. Thus, the essence of a demand schedule lies in its ability to explicitly connect price points with quantities that consumers are willing to purchase.