A farmer has developed a new type of fertilizer. This new fertilizer costs 20 percent more to produce than the old fertilizer but has better results: The same land now produces 25 percent more crops each year. Which statement best describes one way the farm will be affected by using this new fertilizer?
A. The farm's marginal cost for fertilizer will increase.
B. The farm's marginal cost for fertilizer will decrease.
C. The farm's opportunity cost for using fertilizer will decrease.
D. The farm's opportunity cost for using fertilizer will increase.