Read the following article and answer the question by choosing from the options.

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 .

What may have caused the police to knock on the door ?
Select from:
+ My friends parents were having a loud party .;
+ None of the above choices .;
+ The police needed to hear the parents ' side of the story .;
+ There was a loud party .;...A:
There was a loud party .