Fill in the blank (_) in the following sentence from the following choices.
Sentence: Ian watched Joseph wash a stuffed animal because _  knew how to work a washing machine.

Choice 1: Ian watched Joseph wash a stuffed animal because Ian  knew how to work a washing machine.
Choice 2: Ian watched Joseph wash a stuffed animal because Joseph  knew how to work a washing machine.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
2
2.