Fill in the blank (_) in the following sentence from the following choices.
Sentence: Samuel showed Adam how to build a campfire because _ had never been camping before.

Choice 1: Samuel showed Adam how to build a campfire because Samuel had never been camping before.
Choice 2: Samuel showed Adam how to build a campfire because Adam had never been camping before.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
2
2.