Which of the following methods is suitable for preventing an iron frying pan from rusting?
(a)Applying grease
(b) Applying paint
(c) Applying a coating of zinc
(d) All of the above

Options

A. Applying grease
B. Applying paint
C. Applying a coating of zinc
D. All of the above

Explanation

To determine the suitable method for preventing an iron frying pan from rusting, we need to analyze the options provided:

1. **Understanding Rusting**: Rusting occurs when iron reacts with oxygen and moisture in the environment, leading to the formation of iron oxides. This process can degrade the metal over time.

2. **Options Analysis**:
- **(a) Applying grease**: Grease can create a barrier between the iron and the moisture/oxygen, thus preventing rust. However, it may not be practical for a frying pan as it can be removed easily during cooking or cleaning.
- **(b) Applying paint**: Similar to grease, paint can also serve as a protective layer. However, it may not withstand the high temperatures of cooking and can wear off over time.
- **(c) Applying a coating of zinc**: This method, known as galvanization, involves coating the iron with zinc. Zinc not only protects the iron from rusting but also provides cathodic protection, meaning if the zinc layer is damaged, the iron will still be protected as zinc oxidizes preferentially.
- **(d) All of the above**: While all these methods can prevent rusting to some extent, not all are practical for a frying pan.

3. **Conclusion**: Among the options, applying a coating of zinc is the most effective and practical method for preventing rust on an iron frying pan. Therefore, the correct answer is **(c) Applying a coating of zinc**.

### Final Answer:
(c) Applying a coating of zinc