Fill in the blank (_) in the following sentence from the following choices.
Sentence: Lindsey was going on a trip to London and asked Elena how to fit in because _ had previously traveled to London.

Choice 1: Lindsey was going on a trip to London and asked Elena how to fit in because Lindsey had previously traveled to London.
Choice 2: Lindsey was going on a trip to London and asked Elena how to fit in because Elena had previously traveled to London.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
2
2.