Read the following context and choose the best option to answer the question.
Context: It 's a long way to be sustainable country in China . but these nice persons action will change China for sustainable country all over the world . I will walk through China and all over the world not only for China for our earth .
Question: How might this person be described ?
Options: 
- They are an active person .
 - They are an athletic person .
 - They are an activist for the environment .
 - None of the above choices .


They are an activist for the environment .