A farmer wishes to test the effects of a new fertilizer on her corn yield She has four equal sized plots of land one with sandy soil one with rocky soil one with clay rich soil and one with average soil She divides each of the four plots into three equal sized portions and randomly labels them A B and C The four A portions of land are treated with her old fertilizer The four B portions are treated with the new fertilizer and the four C s are treated with no fertilizer At harvest time the corn yield is recorded for each section of land What is the response variable in this experiment OA the four types of soil B the type of fertilizer old new or none OC the section of land A B or C D the corn vield recorded for each section of land