Correct B
incorrect:
A. Giving Super User permission to the partner manager users would provide too much access and would not be a scalable solution. This would give the partner manager users access to all records, including those owned by other partners, which goes against the requirement that partners cannot see each other's data.

C. Creating a permission set granting the View All permission to Case and Container records would also give too much access and would not be a scalable solution. This would give the partner manager users access to all records, including those owned by other partners, which goes against the requirement that partners cannot see each other's data.

D. Creating ownership-based sharing rules for distributors would also not meet the requirement of giving certain individuals at a distributor more visibility. This solution would only allow for sharing based on record ownership, which may not necessarily align with the specific individuals that need more visibility....

Answer is A: Reference: https://help.salesforce.com/s/articleView?id=sf.networks_partner_super_user_access.htm&type=5

Answer is A. Reference : https://help.salesforce.com/s/articleView?id=sf.networks_partner_super_user_access.htm&type=5

Answer is D, as this is a role specific sharing.

A is correct as the Super user respects the same or below role

It says records owned by other partner users and managers. Sharing set shares record associated with user’s account/contact right.. I think answer would be D

It's B - sharing sets give such access based on common Account/Contact. Super User permission would give such an access too, but it will not care about the last condition of the question: "at the same distributor"