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A production manager at a pottery factory has noticed that about $70$ percent of defects

result from impurities in raw materials, $15$ percent result from human error, $10$ percent from

machine malfunctions, and $5$ percent from a variety of other causes. This manager is most

likely using:

A$.$ a Pareto chart.

B$.$ a quality loss function.

C$.$ a scatter diagram.

D$.$ a cause$-$and effect diagram.

E$.$ a flowchart.