Rapid blood loss of one quart or more in an adult can lead to shock and death. So option a. is correct.
You can lose quite a bit of blood without experiencing any side effects or complications. The exact amount depends on your size, age, and general health. Typical causes of blood loss- giving a blood sample for testing at the doctor's office, menstruation, or a nosebleed- won't usually cause complications. But sustaining an injury or undergoing surgery may cause severe bleeding and require a red blood cell transfusion.
When blood loss nears 30 to 40 percent of total blood volume, your body will have a traumatic reaction.
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