A Client Is Prescribed a Vitamin B-12 Injection Every Month

A client is prescribed a vitamin B-12 injection every month. Which of the following should the nurse explain to the client as the purpose of this medication?

A) "It is needed to make new red blood cells."
B) "It makes the red blood cells more flexible."
C) "It makes the red blood cells hold more oxygen."
D) "It makes the red blood cells hold their shape."