Fill in the blank (_) in the following sentence from the following choices.
Sentence: Christine sat at the window and watched for Angela to arrive because _ had missed him while he was gone on a trip.

Choice 1: Christine sat at the window and watched for Angela to arrive because Christine had missed him while he was gone on a trip.
Choice 2: Christine sat at the window and watched for Angela to arrive because Angela had missed him while he was gone on a trip.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
2.