We use cars to get to places - cars are the most effective way of short to medium distance transport and are used by 86% of Americas.
We use cars to calm down - Nothing is better when you are about to go into a rage than going for a long drive with the stereo up and nothing but you and your thoughts.
We use cars to live in - Some people fall on hard times and have to live in their cars for a while. It's more common than you might think.
We use cars to transport supplies - People use cars and other vehicles to carry things to far away places.
Hope this helped. Have a great day!
A or d because there can't just be random commas
It could be both, maybe they hurt themselves because they want to call some attention or it could also be their way to feel better with themselves