Fill in the blank (_) in the following sentence from the following choices.
Sentence: The wall was dirtier than the floor was because we had scrubbed the _ .

Choice 1: The wall was dirtier than the floor was because we had scrubbed the wall .
Choice 2: The wall was dirtier than the floor was because we had scrubbed the floor .
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
2
1. The wall was dirtier than the floor was because we had scrubbed the wall.