Which factor can affect how a client responds to a drug?

A. Pharmacy location: The location of the pharmacy may affect access to medication but does not physiologically influence how a drug works in the body. It does not alter absorption, metabolism, distribution, or excretion of the medication. B. Client's financial status: Financial status may impact adherence if the client cannot afford the medication, but it does not directly affect the pharmacologic response once the drug is administered. C. Client's diet: Diet can significantly influence drug response. Foods may interact with drug absorption (e.g., calcium with tetracyclines), metabolism (e.g., grapefruit juice inhibiting CYP3A4), or excretion, thereby altering the effectiveness and safety of the medication. D. Type of insurance: Insurance affects access to medications and cost coverage but does not change the pharmacokinetics or pharmacodynamics of a drug, so it does not directly affect therapeutic response.