How to divide the voluntary performance of multiple responsibilities for injured fractures?

Hello! A must be responsible, because organizing students to go out to perform, whether profitable or not, is beyond his authority and does not belong to the scope of his duties. During the whole activity, he will be responsible for any accident. Besides, during this period, he also has the responsibility of guardianship for students. If the student has an accident, he will bear the responsibility.

Supermarkets should also bear the responsibility. Because it is the beneficiary of the performance and one of the organizers of the event.

F's behavior belongs to the result of expanding damage. Be responsible for the enlarged loss.

E if there is no medical accident, you don't have to bear the responsibility. After all, surgery and treatment are risky, and no one can guarantee the success of 100%.

D's guardian also has certain responsibilities and can ask for appropriate compensation.

As for the proportion of commitment, it is difficult to have a clear standard. In principle, A and B must be responsible, F is responsible for the exaggerated losses, and D's guardian should compensate appropriately. A is 45%, B is 45%, 10%.