Fill in the blank (_) in the following sentence from the following choices.
Sentence: Betty weighs a lot more than Samantha, so _ has to worry about their weight more often.

Choice 1: Betty weighs a lot more than Samantha, so Betty has to worry about their weight more often.
Choice 2: Betty weighs a lot more than Samantha, so Samantha has to worry about their weight more often.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
2.