Fill in the blank (_) in the following sentence from the following choices.
Sentence: She replaced all of the old kitchen knives with new knives, because the _ were blunt.

Choice 1: She replaced all of the old kitchen knives with new knives, because the old kitchen knives were blunt.
Choice 2: She replaced all of the old kitchen knives with new knives, because the new knives were blunt.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
1.