A container is filled with a liquid up to \[\frac{\mathbf{4}}{\mathbf{5}}\]th of its volume. When 6 bottles of liquid are taken out and four bottles of liquid are poured back into it. It is \[\frac{\mathbf{3}}{\mathbf{4}}\]th of the volume. Find the number of bottles of liquid in the container when the container is full.

• A. 15                   
• B.   40
• C. 39                 
• D.   33
• E. None of these