The weights of four wrestlers participating in a wrestling competition were measured at one-week intervals. The change in the wrestlers' weights in the second measurement compared to the first measurement is shown in the graph below.
If the average weight of the wrestlers in the first measurement was 56 kilograms, what is it in the second measurement?\\
A) 53\\
B) 54\\
C) 55\\
D) 57\\
E) 58