Fill in the blank (_) in the following sentence from the following choices.
Sentence: Christopher but not William would make a good babysitter because _ knew how to handle small children.

Choice 1: Christopher but not William would make a good babysitter because Christopher knew how to handle small children.
Choice 2: Christopher but not William would make a good babysitter because William knew how to handle small children.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
1.