Fill in the blank (_) in the following sentence from the following choices.
Sentence: Katrina had a torso that was twice as wide as that of Betty because _ was rather thin.

Choice 1: Katrina had a torso that was twice as wide as that of Betty because Katrina was rather thin.
Choice 2: Katrina had a torso that was twice as wide as that of Betty because Betty was rather thin.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
2
2.