In these questions, the letters are linked in some way. Identify the relation and complete the last box. \[\text{A2}\,\,\,\text{:}\,\,\,\,\text{B3}\] \[\text{C4}\,\,\,\text{:}\,\,\,\,\text{D5}\] \[\text{E6}\,\,\,\text{:}\,\,\,\,\text{?}\]

• A.  H8                         
• B.         F7         
• C.  F8                         
• D.         H7