You cannot delete a standard report.
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A. B.A.
The correct answer is A. True.
Salesforce provides a set of standard reports to help you analyze your data. These reports are created by Salesforce and are available in your org as soon as you enable the appropriate feature. Standard reports cover a range of business needs, including lead generation, pipeline management, and sales forecasting.
While you can customize a standard report, you cannot delete it. Deleting a standard report could potentially affect other reports that are based on it, as well as any dashboards that use it. Salesforce also recommends against deleting standard reports because they may contain data that is used in other areas of the system.
If you need to remove a standard report from your list of available reports, you can hide it instead. This will remove the report from the Reports tab and the report folder, but it will still be available to users with access to it via other means, such as a direct link or a dashboard.