Concept:
Ambidentate ligands can coordinate through two different atoms.
• Example: $\text{SCN}^-$ can bind through S or N.
Step 1: Identify ligands.
• (A) $\text{F}^-$: Monodentate
• (B) $\text{SCN}^-$: Ambidentate (correct)
• (C) $\text{CN}^-$: Monodentate
• (D) Oxalate: Bidentate but not ambidentate
Step 2: Conclusion.
Thus, isothiocyanato complex contains ambidentate ligand.
Final Answer: Option (B)