Explanation:

- Option 1: Solar

- Solar energy is harnessed from the sun.

- It is renewable as it relies on sunlight, which is abundant and replenished daily.

- Option 2: Wind

- Wind energy is captured through wind turbines.

- It is renewable because wind is a natural and inexhaustible resource.

- Option 3: Nuclear reactors

- Nuclear energy is produced from uranium or plutonium.

- These materials are finite and cannot be replenished quickly.

- Correct Answer: Nuclear reactors are a non-renewable energy source.

- Option 4: All of the above

- This option is incorrect as it includes renewable energy sources.