A 0.75 meter aluminium bar $$25 \times 10^{-4} m^2$$ in cross-sectional area is attached to a 0.50 meter steel bar $$15 \times 10^{-4} m^2$$ in cross-sectional area, as shown in the figure. Take E (Young’s modulus) value of 200 GPa for steel & 70 GPa for aluminum. Total shortening due to an axial compressive force of 175 KN is

A

$$\frac{157}{168}$$ mm

B

$$\frac{175}{168}$$ mm

C

$$\frac{175}{186}$$ mm

D

$$\frac{157}{186}$$ mm