Fill in the blank (_) in the following sentence from the following choices.
Sentence: Benjamin took out a giant speakerphone and began to call out for Aaron because _ lost him.

Choice 1: Benjamin took out a giant speakerphone and began to call out for Aaron because Benjamin lost him.
Choice 2: Benjamin took out a giant speakerphone and began to call out for Aaron because Aaron lost him.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
2.