Fill in the blank (_) in the following sentence from the following choices.
Sentence: She hated the way her hair looked after using the flat iron because the _ was hot.

Choice 1: She hated the way her hair looked after using the flat iron because the hair was hot.
Choice 2: She hated the way her hair looked after using the flat iron because the iron was hot.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
2
2.