Fill in the blank (_) in the following sentence from the following choices.
Sentence: At school, students knees could not show, so the girl changed out of her skirt and put on the dress because the _ was long.

Choice 1: At school, students knees could not show, so the girl changed out of her skirt and put on the dress because the skirt was long.
Choice 2: At school, students knees could not show, so the girl changed out of her skirt and put on the dress because the dress was long.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
2
1.