Fill in the blank (_) in the following sentence from the following choices.
Sentence: John cannot hear the sound of the bell in the other room because of the radio beside him. The _ is loud.

Choice 1: John cannot hear the sound of the bell in the other room because of the radio beside him. The radio is loud.
Choice 2: John cannot hear the sound of the bell in the other room because of the radio beside him. The bell is loud.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
2. The sentence is asking why John can't hear the bell, so the bell must be the one that is loud in this context.