Fill in the blank (_) in the following sentence from the following choices.
Sentence: The two boys planned out a game and then went to draw it on the paper, but quickly realized that the _ was too complex.

Choice 1: The two boys planned out a game and then went to draw it on the paper, but quickly realized that the game was too complex.
Choice 2: The two boys planned out a game and then went to draw it on the paper, but quickly realized that the paper was too complex.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
1.