How much pure alcohol should be added to \[400\text{ }ml\] of strength 15% to make its strength 32% ?

• A.  \[50\text{ }ml\]                              
• B.                         \[\text{75 }ml\]                              
• C.                         \[\text{100 }ml\]                            
• D.                         \[\text{150 }ml\]