You are presented with the question "What has a positive impact on the environment?" and the following answer choices: 
- animals
 - bushes
 - energy
 - peachleaf willow
 - oysters
 - using steel
 - Solar energy
 - Green beans

Now knowing that recycling has a positive impact on the environment and steel is a recycled and recyclable product, choose the best answer.


 

      using steel   