Price MC AC AVC AFC QuantityRefer to the diagram above. Based on the information illustrated in the graph, which of the following is correct? O a) low marginal costs first pull up the overall average costs O b) the transition point between where MC is pulling down and pulling up AC always occurs at the minimum point of the AC curve O C) producing a marginal unit is reducing average costs overall O d) the marginal cost of production for producing an additional unit is below the cost for producing the earlier units