A woman with BO positive blood and her partner with AB positive blood have a child together. Which of the following cannot be the child’s blood type?

A. AB positive B. BB positive C. AO positive D. AA positive E. BB negative

2. Blood transfusion

A 24-year-old man is involved in a road traffic accident and rushed to accident and emergency accompanied by his mother who was unharmed. An examination shows severe abdominal injuries, peripheral cyanosis and cold extremities. The doctor on call decides a blood transfusion is necessary. The mother thinks the patient is blood group B negative but is unsure. The most appropriate blood group to give the patient is?