The Pareto chart is pretty clear, and option C just makes the most sense to me. Although, I do wonder if the designer of this exam is a fan of the Pareto principle. *chuckles*
The Pareto chart clearly shows the significant factors, so I'm going with option C. The effects to keep in the model are E, D, DE, BD and B with an alpha risk of 0.05.
Valene
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