Resonance is an example of

Options

A. forced oscillation
B. damped oscillation
C. free oscillation
D. none of these

Explanation

To solve the question "Resonance is an example of what?", we will analyze the options provided and the concept of resonance in oscillations.

### Step-by-Step Solution:

1. **Understanding Resonance**:
- Resonance occurs when a system is driven by an external force at a frequency that is close to its natural frequency. This results in a significant increase in the amplitude of oscillation.

2. **Identifying the Types of Oscillation**:
- **Forced Oscillation**: This occurs when an external force drives a system to oscillate. The system can oscillate at the frequency of the driving force, and resonance can occur if the driving frequency matches the natural frequency of the system.
- **Damped Oscillation**: This refers to oscillations that decrease in amplitude over time due to energy loss (like friction or air resistance).
- **Free Oscillation**: This occurs when a system oscillates without any external force acting on it, typically at its natural frequency.
- **None of These**: This option suggests that none of the provided options are correct.

3. **Analyzing the Options**:
- The question asks for what type of oscillation resonance is an example of. Since resonance involves an external driving force and occurs when this force's frequency is close to the natural frequency, it is classified as a forced oscillation.

4. **Conclusion**:
- Based on the definitions and analysis, the correct answer to the question is that resonance is an example of **forced oscillation**.

### Final Answer:
Resonance is an example of **forced oscillation**.