You can use standard reports when creating.
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A. B.B.
The question is a bit unclear and incomplete, so I will provide an explanation based on a few possible interpretations:
Can you use standard reports when creating a Lightning Experience app?
Can you use standard reports when creating a custom report in Lightning Experience?
Can you use standard reports when creating a report type in Lightning Experience?
In general, standard reports are pre-built reports that come with Salesforce, and they cannot be modified. However, you can use them as a starting point when creating custom reports, and you can include them in Lightning pages and apps. So, depending on the context, the answer to the question could be either "True" or "False."