137.140—On what basis may the Secretary reject an Indian Tribe's final offer?
         The Secretary may reject an Indian Tribe's final offer for one of the following reasons:
    
    
        
        (a) 
         the amount of funds proposed in the final offer exceeds the applicable funding level to which the Indian Tribe is entitled under the Act;
    
    
        
        (b) 
         the PSFA that is the subject of the final offer is an inherent Federal  function that cannot legally be delegated to an Indian Tribe;
    
    
        
        (c) 
         the Indian Tribe cannot carry out the PSFA in a manner that would not result in significant danger or risk to the public health; or
    
    
        
        (d) 
         the Indian Tribe is not eligible to participate in self-governance under  section 503 of the Act [25 U.S.C. 458aaa-2 ].