Final answer:
The nurse should recommend avoiding foods high in tyramine to a client taking phenelzine.
Step-by-step explanation:
When providing dietary teaching to a client taking phenelzine, the nurse should recommend avoiding foods high in tyramine, such as aged cheese and cured meats (option a). Phenelzine is a monoamine oxidase inhibitor (MAOI), and consuming tyramine-rich foods can cause a hypertensive crisis. Foods rich in vitamin K (option b), caffeine-rich beverages (option c), and high-fiber foods (option d) do not have a direct interaction with phenelzine.