Context: We were all in the basement , probably 30 of us when there was a knock at the door . The cops ! My friends parents were so absolutely cool and bold faced lied to the police that there was noone besides them home , even though there were 15 + cars parked in front of their house . For some reason the police accepted their story and left .

Question: What may have caused the police to knock on the door ?
Options:
0. My friends parents were having a loud party .
1. None of the above choices .
2. The police needed to hear the parents ' side of the story .
3. There was a loud party .
Answer: 3