Which of the Following Most Clearly Distinguishes Between Positive and Normative

Which of the following most clearly distinguishes between positive and normative economics?

A) Positive economics is the study of what ought to be; normative economics is concerned with the facts.
B) Positive economics is the study of the facts; normative economics is concerned with what ought to be.
C) Positive economics is the study of supply and demand in narrowly defined markets such as the market for shoes; normative economics focuses on highly aggregated markets such as the market for all consumer products.
D) Positive economics is the study of goods that are scarce; normative economics is concerned with goods that are not scarce.