He had been sitting in the car for a while waiting for us and listening to the radio . When he went to start his car the battery was dead . So we decided to take my car over there instead . I always hate having to park the car somewhere because then I have to worry is someone going to notice it or is it going to get towed or whatever .
According to the above context, choose the best option to answer the following question.
Question: What caused the car battery to be dead ?
Options:
- None of the above choices .
 - The warranty expired on the car .
 - The car battery was old and had to be replaced .
 - He listened to the radio while the car was turned off and this caused the battery to die .


He listened to the radio while the car was turned off and this caused the battery to die .