A 19-year-old pregnant student presents at her health service allergy clinic with rhinorrhea, sneezing, itching, and conjunctivitis. A RAST test finds IgE antibodies to ragweed antigens. A characteristic of this condition is

A) IL-4 mediated IgE synthesis has increased
B) Desensitization can occur with repeated injection of small doses of IgE
C) Drugs that elevate cGMP can reduce symptoms
D) Placental transfer of ragweed antibody can sensitize her unborn child