If \[\underline{\begin{align} & \underline{\begin{align} & \text{ 1 A} \\ & \times \text{ A} \\ \end{align}} \\ & \,\,B\text{ 6} \\ \end{align}}\], where A and B are single digit numbers, such that B - A = 3, then the values of A and B respectively are _____.

• A.  4, 5                            
• B.  9, 6    
• C.  5, 4                            
• D.  6, 9