Fill in the blank (_) in the following sentence from the following choices.
Sentence: Though they are twins, Jeffrey is much heavier than Jason, as _ hates to exercise.

Choice 1: Though they are twins, Jeffrey is much heavier than Jason, as Jeffrey hates to exercise.
Choice 2: Though they are twins, Jeffrey is much heavier than Jason, as Jason hates to exercise.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
1.