Fill in the blank (_) in the following sentence from the following choices.
Sentence: Aaron was heating the sugar mixture in a pot on the stove. He made a real mess because the _ was too big.

Choice 1: Aaron was heating the sugar mixture in a pot on the stove. He made a real mess because the pot was too big.
Choice 2: Aaron was heating the sugar mixture in a pot on the stove. He made a real mess because the mixture was too big.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
2
2.