Fill in the blank (_) in the following sentence from the following choices.
Sentence: Eric thought it looked like Aaron wasn't listening to him at all, because _ was staring outside.

Choice 1: Eric thought it looked like Aaron wasn't listening to him at all, because Eric was staring outside.
Choice 2: Eric thought it looked like Aaron wasn't listening to him at all, because Aaron was staring outside.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
2
2.