Circular Aluminum Tube of Length L = 650 Mm Is $400 \times 10 ^ { - 6 }$

circular aluminum tube of length L = 650 mm is loaded in compression by forces P. The outside and inside diameters are 80 mm and 68 mm, respectively. A strain gage on the outside of the bar records a normal
Strain in the longitudinal direction of 400 $400 \times 10 ^ { - 6 }$ . The shortening of the bar is approximately:

A) 0.12 mm
B) 0.26 mm
C) 0.36 mm
D) 0.52 mm