Explanation: The best solution to create a report to compare the number of support cases in each status and by priority is to use grouping. Grouping allows the app builder to summarize data by one or more fields, such as status and priority, and display them in rows and columns. Grouping also enables the app builder to use different chart types, such as stacked bar charts or matrix charts, to visualize the data. Bucket columns are not a suitable solution, as they are used to categorize data into predefined groups, such as high, medium, or low. Custom report types are not a suitable solution, as they are used to define the objects and fields available for a report, not how to display them. Filters are not a suitable solution, as they are used to limit the data shown in a report based on certain criteria, not how to compare them.