Three watermelons weigh \[10\frac{1}{2}\text{ kg}\] If 2 of them have a mass of \[2\frac{3}{4}\text{ kg}\]each, what is the mass of the third watermelon?

• A.  \[4\frac{1}{2}\text{ kg}\]                  
• B.  \[\text{4 kg}\] 
• C.    \[\text{5}\frac{1}{2}\]                      
• D.    \[\text{5 kg}\]