Assuming that the underlined clause is : that i had missed the train,
the one that best describes the underlined clause is : A. Noun Clause
Technically, the underlined clause can stand alone as an independent clause. But if it putted together like this, it act as a noun
hope this helps 
        
             
        
        
        
I'm not sure if you want a story about a hour or is that's the name of the story .
        
             
        
        
        
I believe the answer is Work Ethic:)
Hope this helps:)
@SamySamSamantha