Fill in the blank (_) in the following sentence from the following choices.
Sentence: After Betty showed Amy their pet spider, they started screaming. Then _ laughed about it.

Choice 1: After Betty showed Amy their pet spider, they started screaming. Then Betty laughed about it.
Choice 2: After Betty showed Amy their pet spider, they started screaming. Then Amy laughed about it.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
2.