A nurse is reviewing a client's instructions for their prescribed medications. The nurse should identify that which of the following instructions contains household units?

A. Dissolve one packet in 120 mL and drink twice daily: This uses metric units; “mL” (milliliters) is part of the metric system, not household measurements. B. Mix powder with 1 L of water and drink throughout the day: “L” (liters) is a metric unit of volume and not considered a household measurement. C. Take 1 Tbsp by mouth after every meal: “Tbsp” stands for tablespoon, which is a household unit commonly used in cooking and non-metric dosing instructions. D. Take 250 mg by mouth twice daily: “mg” (milligrams) is a metric unit of weight and not part of household measurement systems.