The vines were in a tangle. I stepped into the middle of them.
       
      
                
     
    
    
    
    
    2 answers:
            
                    
              
              
                
                
A past participle is a form of verbs that, if formed regularly, has the form of "stem+ed".
The past participle of "tangle" is "tangled" and the sentence with the past participle is: 
 I stepped into the middle of the tangled vines.
(actually the last sentence also has a past participle in it, but not only, so I am not choosing it). 
                                
             
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B, C and F  I believe... please correct me if I'm wrong, though ^^