Aluminium chloride in acidified aqueous solution forms a complex 'A', in which hybridisation state of Al is 'B'. What are 'A' and 'B', respectively?

• A

  ${\left[\mathrm{Al}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{3+}, {\mathrm{d}}^2{\mathrm{sp}}^3$

• B

  ${\left[\mathrm{Al}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{3+}, {\mathrm{sp}}^3{ \mathrm{d}}^2$

• C

  ${\left[\mathrm{Al}{\left({\mathrm{H}}_2\mathrm{O}\right)}_4\right]}^{3+}, {\mathrm{sp}}^3$

• D

  ${\left[\mathrm{Al}{\left({\mathrm{H}}_2\mathrm{O}\right)}_4\right]}^{3+}, {\mathrm{dsp}}^2$