Which action will the nurse take when performing ear irrigation for a patient with cerumen impaction?

Rationale: A. Using body-temperature fluid prevents stimulation of the vestibular nerve, which can cause dizziness, nausea, or vertigo. B. The syringe should not completely occlude the canal; allowing space prevents pressure buildup and potential injury to the tympanic membrane. C. Inserting applicators (like cotton swabs) into the ear canal can push cerumen deeper or damage the ear canal/tympanic membrane. D. Ear irrigation is best performed with the patient sitting upright, with a basin held under the ear to collect the solution.