Final answer:
C "I have a ringing in my ears." The priority symptom for the nurse to report would be a ringing in the ears, which could indicate ototoxicity.
Step-by-step explanation:
The correct answer in this case is option C, 'I have a ringing in my ears.' While all of the statements could be important to report to the healthcare provider, the ringing in the ears is a symptom that could indicate ototoxicity, which is a potentially serious side effect of vancomycin. Ototoxicity refers to damage to the inner ear caused by certain medications, and it can lead to hearing loss or ringing in the ears. Therefore, it is important for the nurse to report this symptom to the healthcare provider immediately to prevent further complications.