Final answer:
Angela, who has type A blood, can safely receive a blood transfusion from donors with type A or type O blood. Type O is known as the universal donor, compatible with any blood type.
Step-by-step explanation:
If Angela has type A blood, the types of blood that could safely be given to her are type A and type O blood. People with type A blood can receive type A because it is the same group and will not cause an immune response. Moreover, since type O blood does not have A or B antigens on the red blood cells (RBCs), there is no risk for Angela, who has type A blood, to develop an antibody reaction against the type O blood transfused. Therefore, people with type O blood are often called universal donors because they can donate blood to individuals with any other blood type without causing adverse reactions.
Option b) Type A and O is the correct answer in this case.