The correct order of ligands arranged in increasing field strength.

Options

1. A(\mathrm{F}^{-} < \mathrm{Br}^{-} < $\mathrm{I}$^{-} < \mathrm{NH}_3)
2. B(\mathrm{Br}^{-} < \mathrm{F}^{-} < \mathrm{H}_2 \mathrm{O} < \mathrm{NH}_3)
3. C(\mathrm{H}_2 \mathrm{O} < -\mathrm{OH} < \mathrm{CN}^{-} < \mathrm{NH}_3)
4. D(\mathrm{Cl}^{-} < -\mathrm{OH} < \mathrm{Br}^{-} < \mathrm{CN}^{-})