An example of a simple fuel cell is

Options

A. Lead storage battery
B. Leclanche cell
C. `H_(2)-O_(2)` cell
D. All of these

Explanation

To solve the question, "An example of a simple fuel cell is:", we need to analyze the given options and understand the concept of a fuel cell.

### Step-by-Step Solution:

1. **Understanding Fuel Cells**:
- A fuel cell is a device that converts the chemical energy from a fuel (usually hydrogen) into electricity through a chemical reaction with oxygen or another oxidizing agent. This process is continuous as long as fuel and oxidizer are supplied.

2. **Analyzing the Options**:
- **Lead Storage Cell**: This is a type of rechargeable battery, not a fuel cell. It stores energy chemically and can be recharged.
- **Lagrange's Cell**: This is commonly known as a dry cell or primary cell, used in everyday devices like remote controls. It is not a fuel cell.
- **H2O2 Cells**: These cells can refer to hydrogen peroxide cells, which can be used in certain fuel cell applications, but they are not the simplest example of a fuel cell.
- **All of These**: This option suggests that all the previous options are examples of simple fuel cells, which is incorrect based on our analysis.

3. **Identifying the Correct Answer**:
- Among the options, the simplest and most recognized example of a fuel cell is the **Hydrogen-Oxygen Fuel Cell**. This type of fuel cell directly converts the energy from the reaction of hydrogen and oxygen into electricity.

4. **Conclusion**:
- The correct answer to the question is **H2O2 cells**, as they can be considered a simple fuel cell, but the most straightforward example is the Hydrogen-Oxygen Fuel Cell.

### Final Answer:
The correct answer is **H2O2 cells**.

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