In order to find out which evidence will be the best one, we have to pay attention to the point on which author makes accent. As for me, author emphasizes that such physical activity as walking can positively affect our mental state, and the only option which maintains this idea is C. Endorphins released during walking build brain cells and make people feel good, because it points out the mood and state of a person.
What details that are in the text are unclear to me.
Answer: The article focuses on new technology reducing food prices and helping in urbanization
Hope this helps!
Answer:
for the theme or something else?