Tension in the tight side of a belt drive is 100 N and that in the slack side 60 N. If the belt breadth is 10 cm and thickness 4 cm, what is the maximum stress induced in the belt?

A

2.5 N/cm$$^2$$

B

1.5 N/cm$$^2$$

C

4 N/cm$$^2$$

D

2 N/cm$$^2$$