Using the Spectrochemical Series (Order of Increasing D ) Cl

Using the spectrochemical series (order of increasing D ) Cl ^- , the complex that exhibits the largest value of D is:

A) Ir(CN) ₆^{3 -}
B) IrCl₆^{3 -}
C) Co(CN) ₆^{4 -}
D) Co(NH₃) ₆²⁺
E) Co(CN) ₆^{3 -}