Fill in the blank (_) in the following sentence from the following choices.
Sentence: The woman added bleach to the washing machine when washing the sheets but not the shirts because the _ were dingy.

Choice 1: The woman added bleach to the washing machine when washing the sheets but not the shirts because the sheets were dingy.
Choice 2: The woman added bleach to the washing machine when washing the sheets but not the shirts because the shirts were dingy.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
2. The woman added bleach to the washing machine when washing the sheets but not the shirts because the shirts were dingy.