The third blood group can be transfused A) people with groups I and III B) people with groups III and IV

The third blood group can be transfused A) people with groups I and III B) people with groups III and IV C) people with groups II and III D) only people with group III

The third blood group can be transfused to people with either the third or the fourth blood group. It depends on the content of specific proteins in the blood plasma, which can stick together or destroy red blood cells, since they are not always compatible. People with the fourth blood group do not have such proteins. For this reason, any other blood group can be transfused to them.
Answer: B