What does "Q" represent on the graph?

Without any context or additional information, it is impossible to determine what "Q" represents on the graph. It could represent a variety of things depending on the subject matter of the graph. However, based solely on the given possible answers, it is safe to assume that "Q" does not represent the average cost of goods sold or the point where equilibrium is achieved. Therefore, the correct answer is A, the quantity at the equilibrium point. However, it is important to note that this answer is based on an assumption and may not be accurate without further context or information.