**Step-by-Step Solution:**
1. **Understanding Acetic Acid**: Acetic acid is a chemical compound with the formula CH₃COOH. It is known for its sour taste and pungent smell.
2. **Analyzing the Options**:
- **Option 1: Ant Strength**: Ants produce formic acid, not acetic acid. Therefore, this option is incorrect.
- **Option 2: Oranges**: Oranges contain citric acid, which is different from acetic acid. Thus, this option is also incorrect.
- **Option 3: Unripe Mangoes**: Unripe mangoes contain a mixture of acids such as oxalic and tartaric acids, but not acetic acid. Hence, this option is incorrect as well.
- **Option 4: Vinegar**: Vinegar is a common household product that contains acetic acid, typically in concentrations of 3% to 9%. This makes it the correct option.
3. **Conclusion**: Based on the analysis of the options, the correct answer to the question "Acetic acid is found in _____________." is vinegar.
**Final Answer**: Acetic acid is found in vinegar.
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