It is called a cell membrane potential
        
             
        
        
        
 C, some of my close family does logging stuff, and I hear about this all the time.
        
                    
             
        
        
        
It seems you forgot your options, but here are some things found in a chloroplast: 
grana 
Granal thylakoids
Stroma
Nukleloids (DNA rings)
Ribosomes
Starch granules
membranes
Now, some examples of thing NOT found in a chloroplast: 
Endoplasmic Reticulum (that's another organelle)