Fill in the blank (_) in the following sentence from the following choices.
Sentence: Kira struggled to study from her textbook, but found she could learn well from the website, so she stopped using the _ .

Choice 1: Kira struggled to study from her textbook, but found she could learn well from the website, so she stopped using the textbook .
Choice 2: Kira struggled to study from her textbook, but found she could learn well from the website, so she stopped using the website .
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
1.