Fill in the blank (_) in the following sentence from the following choices.
Sentence: Carrie but not Samantha went to the gynecologist to ask for birth control because _ had regular menstruation.

Choice 1: Carrie but not Samantha went to the gynecologist to ask for birth control because Carrie had regular menstruation.
Choice 2: Carrie but not Samantha went to the gynecologist to ask for birth control because Samantha had regular menstruation.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
2
1.