Fill in the blank (_) in the following sentence from the following choices.
Sentence: I have sleep apnea which means I need to improve the ventilation in my home through the windows and closet doors.  I close the _ to improve oxygen levels.

Choice 1: I have sleep apnea which means I need to improve the ventilation in my home through the windows and closet doors.  I close the windows to improve oxygen levels.
Choice 2: I have sleep apnea which means I need to improve the ventilation in my home through the windows and closet doors.  I close the closet doors to improve oxygen levels.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
2
2.