Erythroblastosis foetalis can be avoided by

• A

  Administering anti- Rh antibodies to a $\mathrm{Rh}+$ ve woman before her first pregnancy.
• B

  Administering anti-Rh antibodies to a $\mathrm{Rh}+$ ve mother after her first $\mathrm{Rh}+$ ve child birth.
• C

  Administering anti-Rh antibodies to a $\mathrm{Rh}-$ ve woman before her first pregnancy.
• Correct answer
  D

  Administering anti- Rh antibodies to a $\mathrm{Rh}-$ ve mother after her first $\mathrm{Rh}+$ ve child birth.

Hence, the correct answer is option: 'D'.