Answer: Environmentally safe transportation.
Explanation:
The overall topic is about environmentally safe transportation. Given the whole point of her claim is to give evidence about how walking or biking is the most environmentally safe modes of transportation.
*Extra:
• What does topic mean in English texts?
It is the main subject of a literary text; it is the focus.
*Why are the other answers most likely incorrect?
•Manufacturing of hybrid cars was stated in the claim but it is not the main point of the claim. Biking and walking was also stated in the claim as well.
•Protecting the environment is of course the whole point of trying to find the most environmentally safe modes of transportation but the persons claim overall is mostly focused on environmentally safe transportation.
•Walking as a forms of transportation was also stated but hybrid cars and biking was stated in the claim as well and it is not the main point of the claim.
!Hope this helps! :) If I’m wrong in any way, please tell me.!