Fill in the blank (_) in the following sentence from the following choices.
Sentence: when writing his poem, the words did not fit into the papers, the _ was limited.

Choice 1: when writing his poem, the words did not fit into the papers, the papers was limited.
Choice 2: when writing his poem, the words did not fit into the papers, the words was limited.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
1. The correct answer is "papers" because the sentence is about the papers not being able to hold all the words, so the limitation