If the data is classified by attributes and if hooking two or more characters are to be compared within each attribute, we use the statistical tool as:

Correct option is D

The correct answer is (D) Multiple bar diagram

Explanation:
• A multiple bar diagram (also known as a compound bar chart) is used to represent two or more sets of data simultaneously for comparison.
• For each attribute (category), two or more bars are placed side-by-side to show different characteristics/characters.
• For example, if we want to compare the literacy rates of males and females across different states, we would use a multiple bar diagram where each state has two bars (one for male, one for female).
• This allows for easy visual comparison both within a category and across different categories.

Information Booster:
• Multiple bar diagrams are best suited when the total magnitude of the variables is not the primary focus, but rather the individual comparison of the sub-parts.
• Different colors or hatchings are used to distinguish between the bars representing different characters.
• A legend (index) is always provided to identify what each bar represents.

Additional Knowledge:
• Component bar diagram (Option A): Also called a sub-divided bar diagram, it shows the total value of a variable broken down into its constituent parts in a single bar.
• Percentage bar diagram (Option B): A component bar diagram where the total length of each bar is kept at 100%, and parts are shown as percentages of the total.
• Pie diagram (Option C): A circular chart where the area of sectors represents the proportions of the whole; it is generally used for a single data set, not for side-by-side comparison of multiple attributes.