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 .
What may be the reason for this person walking through China ?
Pick the best answer from the following options:
A. None of the above choices .
B. They want to save money by walking on foot .
C. They like to walk rather than using a car .
D. They want to refrain from using cars .


D