Fill in the blank (_) in the following sentence from the following choices.
Sentence: Christopher had been horseback riding since childhood but Justin had purposefully never been. _ was terrified with horses.

Choice 1: Christopher had been horseback riding since childhood but Justin had purposefully never been. Christopher was terrified with horses.
Choice 2: Christopher had been horseback riding since childhood but Justin had purposefully never been. Justin was terrified with horses.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
2
2.