Partner super users can get insights into the records of other partner users who are at their role level or below them in the account role hierarchy. Super users can access records according to their level of permissions. For example, if a manager with full access to cases is granted Super User Access, then they can view and edit cases of other managers and their direct reports. A different manager who has read-only access to cases can only view the cases of other managers and their direct reports, even as a Super User.

"Record access granted to users via a sharing set isn’t extended to their superiors in the role hierarchy."

I think the answer is D We need to grant read access to peers and subordinates, so the Sharing Set will accomplish this https://help.salesforce.com/s/articleView?id=sf.networks_setting_light_users.htm&type=5

'Partner super users can get insights into the records of other partner users who are at their role level or below them in the account role hierarchy.' https://help.salesforce.com/s/articleView?id=sf.community_builder_cdn_overview.htm&type=5