Fill in the blank (_) in the following sentence from the following choices.
Sentence: When Mary lost her first tooth, Carrie was very excited. _ knew that the tooth fairy would come if she left it under her pillow.

Choice 1: When Mary lost her first tooth, Carrie was very excited. Mary knew that the tooth fairy would come if she left it under her pillow.
Choice 2: When Mary lost her first tooth, Carrie was very excited. Carrie knew that the tooth fairy would come if she left it under her pillow.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
2.