Fill in the blank (_) in the following sentence from the following choices.
Sentence: Megan woke up with a bad hangover but Patricia did not because _ drank vodka at the party.

Choice 1: Megan woke up with a bad hangover but Patricia did not because Megan drank vodka at the party.
Choice 2: Megan woke up with a bad hangover but Patricia did not because Patricia drank vodka at the party.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
1.