The given figure shows 4 bars of different lengths. What is the length of the longest bar?
 
A 7.8 cm 
B 8.2 cm
C 8 cm 
D 8.1 cm
The given figure shows 4 bars of different lengths. What is the length of the longest bar?
 
A 7.8 cm 
B 8.2 cm
C 8 cm 
D 8.1 cm