wash hands before each meal do a science project about energy ride a bike to school instead of riding in a car pack a lunch instead of buying a school lunch
I gave my students this multiple choice question: Which is the best way to help protect the environment?

Only one answer is correct among these 4 choices:
- wash hands before each meal
- do a science project about energy
- ride a bike to school instead of riding in a car
- pack a lunch instead of buying a school lunch

Could you tell me which one is correct?

ride a bike to school instead of riding in a car