In a single stage system, as the optimal order quantity increases, which of the following is true? O A. Risk increases and the reward decreases O B. The probability of increased profit increases O C. The optimal quantity must always be the same as the average estimated demand D. Average profit typically increases until the production quantity reaches a certain value, after which the average profit starts decreasing. E. Average profit typically increases as the production quantity increases until the production quantity reaches a certain value, after which the average profit keeps on increasing, but at a lower rate