A copper rod of $88\text{cm}$ and an aluminium rod of unknown length have their increase in length independent of increase in temperature. The length of aluminium rod is: (${\alpha }_{Cu}=1.7\times 10^{-5}{\text{K}}^{-1}$ and ${\alpha }_{Al}=2.2\times 10^{-5}{\text{K}}^{-1}$)

1. A
   $6.8\text{cm}$
2. B
   $113.9\text{cm}$
3. C
   $88\text{cm}$
4. D
   $68\text{cm}$