The total number of geometrical isomers possible for an octahedral complex of the type $\left[\mathrm{MA}_{2} \mathrm{~B}_{2} \mathrm{C}_{2}\right]$ is $(\mathrm{M}=$ transition metal $; \mathrm{A}, \mathrm{B}$ and $\mathrm{C}$ are monodentate ligands)

• A

  3
• B

  4
• Correct answer
  C

  5
• D

  6

Hence, the correct answer is option: 'C'.