The post Division of the Woodhead Company produces basic posts which can be sold to outside customers or sold to the Lamp Division of the Woodhead Company. Last year the Lamp Division bought all of its 25,000 posts from the Post Division. The following data are available for last year's activities of the Post Division: Suppose the transfers of posts to the Lamp Division cut into sales of the Post Division to outside customers by 15,000 units. Further suppose that an outside supplier is willing to provide the Lamp Division with basic posts at $1.45 each. If the Lamp Division had chosen to buy all of its posts from the outside supplier instead of the Post Division, the change in net operating income for the company as a whole would have been: A. $1.250 decrease B. $10, 250 increase C. $1,000 decrease D) $13, 750 decrease E. None of the above