In these questions, the letters are linked in some way. Identify the relation and complete the last box. \[\text{AA}\,\,\,\text{:}\,\,\,\,\text{CC}\] \[\text{EE}\,\,\,\text{:}\,\,\,\,\text{GG}\] \[\text{II}\,\,\,\text{:}\,\,\,\,\text{?}\]

• A. V            
• B.         S        
• C.  U                           
• D.  Q