Bar Chart is defined as:

• A. A chart that shows the relationship of a part to a whole
• B. A chart with bars whose lengths are proportional to quantities
• C. A line graph
• D. A radar chart

Answer: (B)

Bar charts convey data by the length of rectangular bars that reflect the value for each category, making it easy to compare quantities side by side. This proportion of bar length to quantity is the defining feature of a bar chart, and it works well for showing how different categories stack up against one another. A chart focused on part-to-whole relationships is more typical of a pie chart, where slices represent portions of a total. A line graph, by contrast, shows how values change over time or another continuous variable by connecting data points, and a radar chart uses spokes from a central point to compare multiple variables. So the description that matches a bar chart is bars whose lengths are proportional to quantities.