Answer:Natalie probably used the variable "type of writing utensil
Step-by-step explanation: The representation of numerical data using rectangles (or bars) of equal width and varying height is known as a bar graph. Depending on the distribution and nature of the data, various types of charts or graphs, such as scatter plots, histograms, or box plots, would typically be used to represent the mentioned quantitative variables, such as the price, volume, and weight of each writing utensil.