The answer depends on the design and results of the farmer's experiment. If the experiment was conducted properly, comparing the yields of corn grown in both types of soil with both types of fertilizer, the farmer could potentially draw conclusions about the best soil and the best fertilizer based on the data obtained.
However, if the experiment lacks control or clear results, or if it did not adequately isolate the effects of each variable (soil type and fertilizer type), the farmer might not be able to definitively conclude anything about the best options.
Given the options, if the experiments were well-designed and clear experimental results showed distinct outcomes for soil and fertilizer, then responses A, B, or C might be valid conclusions. If the results were inconclusive or the experimental design wasn’t adequate, D would be the correct choice.
Without specific results from the experiment, the safest conclusion would be:
D: It is NOT possible to conclude from this experiment which soil is best for growing his corn or which fertilizer is best for growing his corn.