Context: 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 .
Question: What caused the car battery to be dead ?
Option 0: The car battery was old and had to be replaced .
Option 1: None of the above choices .
Option 2: The warranty expired on the car .
Option 3: Using auxiliary power while playing the radio in the car killed the battery .
Answer: 3