Fill in the blank (_) in the following sentence from the following choices.
Sentence: When it came to athletics Cynthia was very good but Laura was not because _ was a good athlete.

Choice 1: When it came to athletics Cynthia was very good but Laura was not because Cynthia was a good athlete.
Choice 2: When it came to athletics Cynthia was very good but Laura was not because Laura was a good athlete.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
1.