Sonia talked on the telephone to two of her friends, She talked to Shivani for \[\frac{1}{4}\] hour and to Geetika for \[\frac{1}{3}\]hour. How much time did Sonia spent of the telephone?

• A.  \[\frac{1}{6}\] hour                  
• B.  \[\frac{2}{7}\] hour      
• C.  \[\frac{5}{12}\]hour                 
• D.  \[\frac{7}{12}\]hour