Match the following

	Complex		Colour
I)	${\left[\mathrm{Ni}{\left({\mathrm{H}}_2\mathrm{O}\right)}_4\mathrm{en}\right]}_{\mathrm{aq}}^{2+}$	A)	Grey – green
II)	${\left[\mathrm{Ni}{\left({\mathrm{H}}_2\mathrm{O}\right)}_2{\left(\mathrm{en}\right)}_2\right]}_{\mathrm{aq}}^{2+}$	B)	Violet
III)	${\left[\mathrm{Ni}{\left(\mathrm{en}\right)}_3\right]}_{\mathrm{aq}}^{2+}$	C)	Blue/Purple
IV)	$\mathrm{Cr}\left[{\left({\mathrm{H}}_2\mathrm{O}\right)}_5\mathrm{Cl}\right]{\mathrm{Cl}}_2.{\mathrm{H}}_2\mathrm{O}$	D)	Pale blue

The correct match is 

• A

  I-D, II- C, III- B, IV- A

• B

  I-B, II- A, III- C, IV- D

• C

  I-A, II- D, III- B, IV- C

• D

  I-C, II- A, III- B, IV- D