Fill in the blank (_) in the following sentence from the following choices.
Sentence: Kayla was able to keep flowers alive longer than Amy because _ had a black thumb.

Choice 1: Kayla was able to keep flowers alive longer than Amy because Kayla had a black thumb.
Choice 2: Kayla was able to keep flowers alive longer than Amy because Amy had a black thumb.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
2
2. This is because the sentence states that Kayla was able to keep flowers alive longer than Amy, so Amy must have had the black thumb