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call the broker to find out what they do. why should we speculate? However, I agree with your logic. 

if i were to make bookkeeping (journal) entries for what occurred here's what I would show. Am I sure this is what the tax laws would say is your basis in the MLP - Nope.  Just trying to be logical which can't always be said for the tax laws. 

 

 

    DR CR
CASH              1.00
CALL OPTION            1.00  
  PURCHASE    
CASH              2.50
BASIS MLP            2.50  
  EXERCISE    
BASIS MLP            2.50  
CALL OPTION              1.00
1256 GAIN              1.50
 

ENTRY TO RECORD GAIN

 

   
       
       
SUMMARY      
CASH              3.50
BASIS MLP            5.00  
1256 GAIN              1.50