Fill in the blank (_) in the following sentence from the following choices.
Sentence: Amy's handwriting was meticulous, while Cynthia's handwriting was often sloppy, because _ was careless about their work.

Choice 1: Amy's handwriting was meticulous, while Cynthia's handwriting was often sloppy, because Amy was careless about their work.
Choice 2: Amy's handwriting was meticulous, while Cynthia's handwriting was often sloppy, because Cynthia was careless about their work.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
2.