Final answer:
The nurse should ask the client why they want to delay taking their diuretic medication to make an informed decision. For home treatment of a systemic infection, oral or parenteral routes of antimicrobial administration are appropriate.
Step-by-step explanation:
When a client expresses a wish to delay taking a medication, in this case a 'fluid pill' or diuretic, the nurse should C. Ask the client the reason for delaying the medication. It is important to understand the client's concerns and to assess if the delay could negatively impact the client's health. After understanding the client's reasoning, the nurse can then make an informed decision on whether to administer, withhold the medication, or seek further instructions from the provider as necessary. As for administering antimicrobial medication for a systemic infection at home, the appropriate and convenient routes of administration could be A. oral or D. parenteral, depending on the type of medication prescribed and the patient's condition. Oral administration is generally considered more convenient for home use.