First Principles of Business Law

Question 17

A leases an office building from B.  In terms of the lease, B is obliged to do any necessary repairs to the building.  A is allowed to sublet the space in the building to other tenants.  A sublets three offices to C.  When C’s roof leaks, C asks B to fix it, and threatens to sue him if he does not.  In the light of these facts, which one of the listed cases would B rely on to argue that C has no right to bring an action to enforce B’s obligation to repair the building.