During the discussion on the importance of car maintenance to safety, the following reason was given for having windshield wipers that work properly:

a. Properly working windshield wipers are critical to visibility being able to see out and have others see where you're looking so they can anticipate your actions
b. Improperly working wipers will take your attention away from driving, creating a significant hazard
c. Improperly working wipers can scratch the windshield, making it prone to cracking and to shattering in a crash, making windshield glass likely to enter the car
d. All of these answers are correct