Final answer:
The nurse should withhold the medication and notify the provider.
Step-by-step explanation:
The nurse should take action B: withhold the medication and notify the provider.
When a client reports an allergy to penicillin, it is important to take it seriously and avoid administering any medications related to penicillin, such as amoxicillin/clavulanic. This is because individuals who are allergic to penicillin can experience a severe allergic reaction if exposed to it again, which can be life-threatening.
Therefore, the appropriate action for the nurse to take is to withhold the medication and notify the provider, who can then assess the situation and prescribe an alternative medication.