Which of the following is NOT true of​ one-way analysis of variance experimental​ design? Choose the correct answer below. A. Using a rigorously controlled design is one way to reduce the effect of extraneous factors. B. Good results require that experiments be carefully designed and executed. C. In any​ design, if the conclusion is that the differences among the means are​ significant, the differences are explained by the factor used. D. A completely randomized experimental design is one way to reduce the effect of extraneous factors.