Fill in the blank (_) in the following sentence from the following choices.
Sentence: The task was not completed by Sarah unlike the task of Betty, because _ was very unprepared.

Choice 1: The task was not completed by Sarah unlike the task of Betty, because Sarah was very unprepared.
Choice 2: The task was not completed by Sarah unlike the task of Betty, because Betty was very unprepared.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
1.