Fill in the blank (_) in the following sentence from the following choices.
Sentence: As it began to rain, Aaron ran to Christopher because _ was carrying an umbrella.

Choice 1: As it began to rain, Aaron ran to Christopher because Aaron was carrying an umbrella.
Choice 2: As it began to rain, Aaron ran to Christopher because Christopher was carrying an umbrella.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
2
2.