A Strong Crystal Field Produces a Large Value for the Crystal

A strong crystal field produces a large value for the crystal field splitting, $\Delta$ o , whereas a weak crystal field produces a small crystal field splitting.Which complex ion most likely contains a metal ion in a low-spin configuration?

A) [NiBr₄] ^{2 -}
B) [Fe(H₂O) ₆]^{2 +}
C) [CoF₆]^3?2
D) [Cr(H₂O) ₂Cl₄] ^{2 -}
E) [Co(CN) ₆]^{3 +}