Final answer:
A pie chart is best suited for displaying contrasts and proportions between a limited number of categories within a whole. It is not ideal for representing trends or complex relationships, which are better showcased by line or bar graphs. The correct option is b.
Step-by-step explanation:
The question pertains to understanding the most effective method of data representation using graphical tools like pie charts, bar graphs, and line graphs. Each type of graph has a specific use case based on the nature of the information to be communicated. A pie chart is particularly useful for showing the proportions and relative sizes of parts within a whole.
Pie charts are a visual tool used to represent data in a circular graph, where each 'slice' corresponds to a category's proportion about the entire 'pie.' This type of chart is most effective when you wish to emphasize the contribution of each part to the total. They are less effective when there are too many categories, as this can lead to a graph that is difficult to interpret.
With these considerations in mind, a pie chart is ideal for displaying simple contrasts and proportions between a small number of categories. It is less suited for showing trends or complex relationships, which might be better represented on a line or bar graph.