Answer
We can rank the rods according to their strain:
$A = B \gt C$
Work Step by Step
We can find the strain of each rod:
Rod A:
$\frac{\Delta L}{L} = \frac{\Delta L_0}{2~L_0} = 0.5~\frac{\Delta L_0}{L_0}$
Rod B:
$\frac{\Delta L}{L} = \frac{2~\Delta L_0}{4~L_0} = 0.5~\frac{\Delta L_0}{L_0}$
Rod C:
$\frac{\Delta L}{L} = \frac{4~\Delta L_0}{10~L_0} = 0.4~\frac{\Delta L_0}{L_0}$
We can rank the rods according to their strain:
$A = B \gt C$
