Final answer:
The nurse should assure the client that cyanocobalamin is safe for her baby during pregnancy.
Step-by-step explanation:
The best response by the nurse is option 4: No, this is safe in either pill or injectable form; it is a Pregnancy Category A drug which means it is safe for your baby.
Cyanocobalamin, also known as vitamin B12, is an essential nutrient that is important for normal fetal growth and development. It is commonly prescribed to pregnant women to ensure they have adequate levels of vitamin B12. Pregnancy Category A drugs are considered safe for use during pregnancy, as there is no evidence of fetal risk based on well-controlled human studies.