Fill in the blank (_) in the following sentence from the following choices.
Sentence: Robert always got worse marks for behavior on report cards than Nick, because _ obeyed the teacher's requests.

Choice 1: Robert always got worse marks for behavior on report cards than Nick, because Robert obeyed the teacher's requests.
Choice 2: Robert always got worse marks for behavior on report cards than Nick, because Nick obeyed the teacher's requests.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
2
1. (Robert got worse marks for behavior because he didn't obey the teacher's requests, while Nick obeyed them.)