Average adult blood volume is...

A blood volume of 12 liters significantly exceeds the normal range for adults. Such a volume is not physiologically feasible as it would lead to severe health issues, including hypertension and potential heart failure. The human body typically does not accommodate such an excess of blood volume.

While 10 liters is closer to a plausible volume than 12 liters, it still exceeds the average adult blood volume. A blood volume of 10 liters would be uncommon and likely indicative of severe medical conditions or an error in measurement, as the typical blood volume for adults is around 5 liters.

A blood volume of 2 liters is considerably lower than the expected average for an adult. Such a deficiency would be indicative of severe blood loss or anemia, which could threaten life if not addressed. Healthy adults generally maintain a blood volume of approximately 5 liters to support normal bodily functions.