In which of the following transition metal ion complexes, the colour in not due to d-d transition?
A. `[Ti(H_(2)O)_(6)]^(3+) and [CoF_(6)]^(3)`
B. `[Ti(H_(2)O)_(6)]^(3+) and [MnO_(4)]`
C. `[CoF_(6)]^(3) and [CrO_(4)]^(2)`
D. `[MnO_(4)] and [CrO_(4)]^(2)`
