The answer would be "Estoy escribiendo" because estan means they are, esta means he is, and estamos means we are, adn we are talking about something in first person and estoy means I am so this perfectly fits it
Hope this helps
        
                    
             
        
        
        
Honestly all of these are good fits. Is there any context to base this off of?
Because A. mean She always wants to make up. 
B. & C. both mean she wants to put on makeup.
and D means she always wants us to make up.
 
        
                    
             
        
        
        
Marta va al depósito de grúa a recoger su auto