Find the difference in EAN of the complexes : 

$\left[\mathrm{Ti}{\left(\sigma -{\mathrm{C}}_5{\mathrm{H}}_5\right)}_2{\left(\pi -{\mathrm{C}}_5{\mathrm{H}}_5\right)}_2\right]\text{ and }\left[\mathrm{Cr}{\left({\mathrm{C}}_6{\mathrm{H}}_6\right)}_2\right]$

EAN for  $\left[{\mathrm{Ti}}^{+4}{\left(\sigma -{\mathrm{C}}_5{\mathrm{H}}_2\right)}_2{\left(\pi -{\mathrm{C}}_5{\mathrm{H}}_5\right)}_2\right]$ is 

$\mathrm{EAN}=22-4+2\times 2+6\times 2=34$

EAN for $\left[\mathrm{Cr}{\left({\mathrm{C}}_6{\mathrm{H}}_6\right)}_2\right]$ 

$\mathrm{EAN}=24+6\times 2=36$

The difference in the EAN value is,

$$\begin{gathered} =36-34 \\ =2 \end{gathered}$$

Hence correct option is A.