Chris and his family have developed a successful business selling a liquid spray fertilizer to farmers. The fertilizer consists of rich, organic, composted material. Recently, Organic Seed, a national seed company, has been marketing a powdered chemical fertilizer to its customers; Organic's fertilizer is less expensive than Chris's product. Organic's efforts are an example of the in Porter's model for industry analysis. A. buyers' negotiating influenceB. threats of substitute products and servicesC. power of the suppliersD. rivalry among competitorsE. threats of new ideas