Five hooks are placed on a wall at equal heights from the ground and spaced 14 cm apart. Ayşe hangs two identical rectangular bags, each with a long side of 28 cm and arm straps connecting the endpoints of the long side, on these hooks as shown in the figure.
In this case, Ayşe measures the heights of her bags from the ground as 60 and 72 cm.
Accordingly, what is the length of the arm strap of one of the bags in cm?
A) 100
B) 108
C) 112
D) 120
E) 124