Read the following context and choose the best option to answer the question.
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: 
- None of the above choices .
 - I thought I heard noises made by a vehicle .
 - I kept hearing noises made by an ambulance .
 - I kept hearing my grandma yelling at someone .


I thought I heard noises made by a vehicle .