A saturated fatty acid is

Options

A. Oleic acid
B. Linoleic acid
C. Stearic acid
D. All

Answer

### Step-by-Step Solution:

1. **Definition of Saturated Fatty Acid**:
A saturated fatty acid is a type of fat where the fatty acid chains contain only single bonds between the carbon atoms. This means that each carbon atom in the chain is fully "saturated" with hydrogen atoms.

2. **Identifying Examples**:
- **Oleic Acid**: This is a monounsaturated fatty acid, which means it contains one double bond in its structure. Therefore, it does not qualify as a saturated fatty acid.
- **Linoleic Acid**: This is a polyunsaturated fatty acid, meaning it has more than one double bond in its structure. Thus, it is also not a saturated fatty acid.
- **Stearic Acid**: This is a long-chain fatty acid that contains only single bonds between the carbon atoms, making it a saturated fatty acid.

3. **Conclusion**:
Among the given options, stearic acid is the only saturated fatty acid. Therefore, the correct answer is stearic acid.