It helped people use less gas. It kept people from driving too fast. It made cars easier for people to buy. It made cars safer to drive in bad weather.
I gave my students this multiple choice question: In 1903 Mary Anderson invented the first windshield wiper. How did this invention most likely help people?

Only one answer is correct among these 4 choices:
- It helped people use less gas.
- It kept people from driving too fast.
- It made cars easier for people to buy.
- It made cars safer to drive in bad weather.

Could you tell me which one is correct?

It made cars safer to drive in bad weather.