No usar la carro. The question is asking you what you can do to limit your effect on exercising carbon footprint. Not using the car is a good option for that, but if your teacher said something else in class, I would use that.
I would say letter A or ahorraron
Explanation:
El contexto histórico es el conjunto de circunstancias temporales, sociales y culturales que rodean un evento, una obra artística o un referente determinado, y que pueden resultar relevantes para entender mejor su contenido.