Put the sentences (a-c) in the correct order to complete a logical text.

Energy is essential for our daily lives. However, not all forms of energy are sustainable. _____.

a. Therefore, using renewable sources like wind and solar power can help reduce environmental impact.

b. On the other hand, fossil fuels like coal and oil are limited and cause pollution.

c. Firstly, renewable energy is better for the planet because it doesn’t produce harmful emissions.