Fill in the blank (_) in the following sentence from the following choices.
Sentence: Robert entered into Brian's office, but our moody boss was not around. _ was relieved.

Choice 1: Robert entered into Brian's office, but our moody boss was not around. Robert was relieved.
Choice 2: Robert entered into Brian's office, but our moody boss was not around. Brian was relieved.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
1.