A Nurse Explained to a New Mother That Because She

A nurse explained to a new mother that because she had tested positive for the hepatitis B virus,her newborn son would need the hepatitis B vaccine immediately and then also an immune globulin injection."Wait," said the new mother."Why is my son getting two shots?" Which of the following statements would be the best response by the nurse?

A) "One injection protects your son, while the other encourages his body to build up immunity."
B) "One shot keeps your son from getting sick, while the other is a typical vaccine to prevent you from accidentally infecting him."
C) "Since you've already been infected with the virus, your son needs twice as much protection."
D) "The second shot is just to make sure the first one works."