D. You should access the Microsoft 365 admin center, and navigate to the Users blade.
To detect all users in a Microsoft 365 subscription who have a Microsoft Office 365 license as a result of belonging to a group, you can use the Microsoft 365 admin center and navigate to the Users blade. From there, you can filter the list of users by license type and group membership to identify the users who have been assigned licenses through the specified group.
Option A (accessing the Azure portal and navigating to the Licenses blade) is not the best choice, as this blade does not provide information on group membership.
Option B (accessing the Microsoft 365 admin center and navigating to the Products blade) is also not the best choice, as this blade provides information on the available products and services, but not on group membership or license assignment.
Option C (accessing the Azure portal and navigating to the Monitor blade) is not relevant to this task, as the Monitor blade is focused on monitoring and analyzing usage and performance data for Azure services.