Roja bought \[1\frac{1}{2}kg\] of sugar. Kamala bought half as much sugar as Roja. What was the total mass of sugar bought by both of them?

• A. \[2\frac{1}{4}kg\]                      
• B.                    \[2\frac{1}{2}kg\]                      
• C.                    \[4\frac{1}{2}kg\]                                  
• D.                    \[3\,\,kg\]