Context: I kept hearing car noises . The time turned to early morning and I was still awake listening to music on the computer . Then , there was pounding on door , almost opened and my grandma yelled at me to shut it . I shut and locked it again and looked through the eye hole thing .

Question: What may have happened before the pounding on the door ?
Options:
0. None of the above choices .
1. I thought I heard noises made by a vehicle .
2. I kept hearing noises made by an ambulance .
3. I kept hearing my grandma yelling at someone .
Answer: 1