Fill in the blank (_) in the following sentence from the following choices.
Sentence: Learning to dance was something that came hard to Betty but posed no challenge to Rebecca because _ had a musical bone.

Choice 1: Learning to dance was something that came hard to Betty but posed no challenge to Rebecca because Betty had a musical bone.
Choice 2: Learning to dance was something that came hard to Betty but posed no challenge to Rebecca because Rebecca had a musical bone.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
2
2.