If the angles of a triangle are in the ratio \[2:3:4,\]what is the difference between the greatest and the smallest angles?

• A.  \[{{10}^{o}}\]                   
• B.                         \[{{20}^{o}}\]  
• C.                         \[{{30}^{o}}\]                   
• D.                         \[{{40}^{o}}\]