A、There was a chicken on the road. B、An explosion damaged the car. C、She ran into a truck. D、Some metal in the car was torn up.

After X-rays showed no broken bones, I stopped for some takeout food and pulled onto the highway, worrying about the afternoon’ s appointments. I passed a carton of milk back to my son.
    "Oh, Mommy, I spilled it. " My left hand tightened on the wheel as I tried to concentrate on the road while handing him a couple of napkins with my right hand. Then I gave him some chicken, not seeing the abandoned truck on the roadside. Suddenly the world exploded into a roar of tearing metal. Then stillness.
    My car had turned 180 degrees and stopped. I was looking through a cracked windshield at three lanes of oncoming traffic. The right front corner of the car was gone.
    Though I hurt all over and my mouth was full of blood, I unfastened my seat belt, jumped from the car and got my son. I grabbed him and rushed up the bank, where I clung to him, looking at the wreck that had been our family car.
    Q16: What is the passage mainly about?
    Q17: How did the speaker have the accident?
    Q18: Why did the speaker give napkins to her son?