For each of the following data visualization goals, propose and describe in detail the chart, graph, or other form of data visualization you would use to present it on a dashboard. Explain the reasons for your design choices.
(a) Compare the relative proportions of customer purchases made with cash, credit cards, and debit cards.
(b) Show monthly progress toward a goal of reducing defective product returns to less than 2% of purchases by the end of the current year.
(c) Show the number of pizza delivery orders placed in each neighborhood of a city to plan more efficient delivery routes.