Final answer:
The approximate blood volume of the adult patient who weighs 48 kg is 3.84 liters.
Step-by-step explanation:
The average adult body contains between 4.7 and 5.7 liters of blood. Since the patient weighs 48 kg, we can estimate her blood volume by assuming it is approximately 8% of her body weight. Using this estimate, we can calculate that her blood volume is approximately 3.84 liters. Therefore, the closest answer choice would be 3.8 L.