In these questions, the letters are linked in some way. Identify the relation and complete the last box. \[\text{MNO}\,\,\,\text{:}\,\,\,\,\text{QRS}\] \[\text{BCD}\,\,\,\text{:}\,\,\,\,\text{FGH}\] \[\text{XYZ}\,\,\,\text{:}\,\,\,\,\text{?}\]

• A.  ABC                      
• B.  DEF    
• C.  BCD      
• D.         EFG