Rancidity can be prevented by

Options

A. adding antioxidants
B. packaging oily food in nitrogen gas
C. both (a) and (b)
D. none of these

Explanation

To answer the question "Rancidity can be prevented by," we will analyze the options provided and understand the concept of rancidity.

### Step-by-Step Solution:

1. **Understanding Rancidity**:
- Rancidity refers to the spoilage of food, particularly fats and oils, which leads to unpleasant odors and tastes. This spoilage is primarily caused by the oxidation of fats.

2. **Identifying Causes of Rancidity**:
- The oxidation process occurs when fats and oils react with oxygen in the air. This reaction can lead to the formation of free radicals and other compounds that contribute to the off-flavors and smells associated with rancidity.

3. **Exploring Prevention Methods**:
- To prevent rancidity, we can look at methods that inhibit the oxidation of fats and oils.

4. **Option A: Adding Antioxidants**:
- Antioxidants are substances that can slow down the oxidation process. By adding antioxidants to food, we can help prevent the fats from oxidizing and thereby reduce rancidity. This is a valid method of prevention.

5. **Option B: Packaging Oily Food in Nitrogen Gas**:
- Nitrogen gas is an inert gas that does not react with food. By packaging food in nitrogen, we can displace oxygen and reduce the chances of oxidation occurring. This method is also effective in preventing rancidity.

6. **Evaluating the Options**:
- Option A states that adding antioxidants can prevent rancidity, which is correct.
- Option B states that packaging oily food in nitrogen gas can also prevent rancidity, which is also correct.
- Therefore, both options A and B are valid methods for preventing rancidity.

7. **Conclusion**:
- Since both methods are effective, the correct answer to the question is **Option C: Both A and B**.

### Final Answer:
**Rancidity can be prevented by: C. Both A and B**

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