Use the Following to Answer Question

Multiple Choice

Use the following to answer question
Figure: Crop Yield and Fertilizer
-(Figure: Crop Yield and Fertilizer) The graph shows a hypothetical relationship between tons of fertilizer used and crop yields.Which of the following is NOT correct?

A) The slope of the curve between one and two tons of fertilizer is approximately 2.
B) The relationship between fertilizer usage and yield is nonlinear.
C) Because the relationship is nonlinear,it is difficult to create an economic model describing the relationship between the two variables.
D) Using more than three tons of fertilizer has minimal effect on yield.