The cross section of a compound bar 1 m long is as shown in figure. If the temperature is raised by $$80^\circ$$ C determine the stresses (in N/mm$$^2$$) in each metal

A

$$ \sigma_{c}  = 20$$ (compressive),

$$\sigma_{ss} = 30$$ (tensile)

B

$$ \sigma_{c} =30$$ (compressive),

$$\sigma_{ss} = 20$$ (tensile)$$

C

$$ \sigma_{c} = 30$$ (tensile),

$$\sigma_{ss} = 20$$ (compressive)

D

$$ \sigma_{c} =30$$ (tensile),

$$\sigma_{ss} = 20$$ (tensile)