A metal bar of the variable cross-section as shown and length is subjected to 1000 kN of force. The area of the 1 m long section is 10000 mm2 and that of the 500 mm long section is 5000 mm2. Assuming the elastic modulus of 200 GPa, the total elongation of the bar will be

• A. 2.5 mm
• B. 0.025 mm
• C. 0.25 mm
• D. 25 mm
• E. 1.5 mm