Fill in the blank (_) in the following sentence from the following choices.
Sentence: Nick was allowed to pass through the terminal but Adam was stopped, since _ 's passport was expired.

Choice 1: Nick was allowed to pass through the terminal but Adam was stopped, since Nick 's passport was expired.
Choice 2: Nick was allowed to pass through the terminal but Adam was stopped, since Adam 's passport was expired.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
2
2.