Fill in the blank (_) in the following sentence from the following choices.
Sentence: Christopher wasn't a plumber but he knew Matthew was so _ showed up to fix his sink.

Choice 1: Christopher wasn't a plumber but he knew Matthew was so Christopher showed up to fix his sink.
Choice 2: Christopher wasn't a plumber but he knew Matthew was so Matthew showed up to fix his sink.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
2
2.