Fill in the blank (_) in the following sentence from the following choices.
Sentence: The students cannot hear the teacher's voice because of the noise from the other class. The _ is high.

Choice 1: The students cannot hear the teacher's voice because of the noise from the other class. The noise is high.
Choice 2: The students cannot hear the teacher's voice because of the noise from the other class. The voice is high.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
1.