Order: Diazepam 4 mg via nasogastric tube three times daily. Available: Diazepam oral solution 5 mg per 5 mL. How many milliliters should the client receive per dosage?

Choice A reason: 2 mL provides 2 mg (5 mg/5 mL = 1 mg/mL, so 2 mL = 2 mg), which is half the ordered 4 mg. This underdoses the patient, making it incorrect for the prescribed dosage. Choice B reason: Diazepam 5 mg/5 mL means 1 mg/mL. For 4 mg, 4 mL is needed (4 mg ÷ 1 mg/mL = 4 mL). This delivers the correct dose, making 4 mL the correct answer. Choice C reason: 5 mL delivers 5 mg (5 mg/5 mL), exceeding the ordered 4 mg. This overdoses the patient, risking sedation, making 5 mL incorrect for the prescribed dosage. Choice D reason: 6 mL delivers 6 mg, significantly exceeding the 4 mg order. This overdose increases side effects like respiratory depression, making 6 mL incorrect for the correct dosage.