The correct order of the wavelength of light absorbed by the following complexes is, A. $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}$ B. $\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-}$ C. $\left[\mathrm{Cu}\left(\mathrm{H}_2 \mathrm{O}\right)_4\right]^{2+}$ D. $\left[\mathrm{Ti}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$ Choose the correct answer from the options given below:

• A

  $\mathrm{B} \lt \mathrm{D} \lt \mathrm{A} \lt \mathrm{C}$
• Correct answer
  B

  $\mathrm{B} \lt \mathrm{A} \lt \mathrm{D} \lt \mathrm{C}$
• C

  $\mathrm{C} \lt \mathrm{D} \lt \mathrm{A} \lt \mathrm{B}$
• D

  $\mathrm{C} \lt \mathrm{A} \lt \mathrm{D} \lt \mathrm{B}$

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