Which of these would be most appropriate for graphically plotting the correlation between two product characteristics, such as the diameter and weight of tennis balls?

A) A fishbone diagram
B) A histogram
C) A run chart
D) A scatter diagram
E) A control chart

A scatter diagram is the most appropriate for graphically plotting the correlation between two product characteristics. It is a visual representation of the relationship between two variables, with one variable plotted on the x-axis and the other variable plotted on the y-axis. Each point on the scatter diagram represents a pair of values for the two variables being analyzed, allowing for a quick interpretation of the relationship between them.