A 0.75 meter aluminium bar 25 × 10-4 m2 in cross-sectional are attached to a 0.50 meter steel bar 15 × 10-4 m2 in cross-section area, as shown in the figure. Take E (Young’s modulus) value of 200 GPa for steel and 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. \(\frac{{157}}{{186}}~mm\)