IN the BD Spl, the water must be filled ________. A. Once a week B. Two week C. Three Week D. None of these

Option B is incorrect because the BD Spl should be filled with fresh, sterile saline solution every week, not every two weeks.

Option C is incorrect because the BD Spl should be filled with fresh, sterile saline solution every week, not every three weeks.

Option D is incorrect because the BD Spl must be filled with fresh, sterile saline solution every week.