Select the correct answer. A farmer uses one pound of fertilizer to grow crops on his land. He decides to increase the amount of fertilizer added to the soil to three pounds to obtain a greater yield. The size of the garden and the amounts of seeds, water, and sunlight remain the same. The farmer keeps increasing the amount of fertilizer (to four, five, and six pounds, etc.), and continues to gain higher yields. However, since the other factors of production remain constant, the increase in crop yield is lower than the increase in a single factor of production (fertilizer). What is the term for this phenomenon? A. economic order quantity (EOQ) B. law of diminishing returns C. economy of scale D. labor productivity E. production control