The ligand `S^(2-)` is named in coordination compounds as :

Options

A. thio
B. sulfide
C. sulfido
D. none of these.

Explanation

To determine the name of the ligand \( S^{2-} \) in coordination compounds, we can follow these steps:

### Step 1: Identify the Ligand
The ligand in question is \( S^{2-} \). This is an anionic species, which is important for naming in coordination chemistry.

### Step 2: Understand the Naming Conventions
In coordination chemistry, ligands are named based on their charge and structure. Anionic ligands typically end with the suffix "-ido" when they are part of a coordination compound.

### Step 3: Compare with Common Ligands
- **Sulfide**: The term "sulfide" refers to the \( S^{2-} \) ion itself, but in coordination chemistry, it is not the preferred name.
- **Thio**: This prefix is often used for ligands containing sulfur, particularly when they are part of a thiol group (like \( R-SH \)).
- **Sulfido**: This is the correct term used for the \( S^{2-} \) ligand in coordination compounds.

### Step 4: Conclusion
Given that \( S^{2-} \) is an anionic ligand, the correct nomenclature in coordination chemistry is "sulfido".

Thus, the answer to the question is:
**Sulfido**