The correct answer is option 3, which states that if a man has a positive Rh blood factor and a woman has a negative Rh blood factor, there is a risk of giving birth to a still-born baby with symptoms of "Erythroblastosis foetalis".

To understand why this combination carries a risk, we need to understand the Rh factor. The Rh factor is a protein that can be present on the surface of red blood cells. People who have the protein are Rh positive (+), while those who don`t have the protein are Rh negative (-).

During pregnancy, if the mother is Rh negative and the baby is Rh positive, there can be a problem. This is because if the baby`s Rh positive blood enters the mother`s Rh negative bloodstream, the mother`s body may produce antibodies against the Rh factor.

If the mother becomes sensitized to the Rh factor, her antibodies may cross the placenta and attack the Rh positive red blood cells of a future Rh positive baby. This immune response can lead to a condition called "Erythroblastosis foetalis," where the baby`s red blood cells are destroyed, causing severe anemia.

In the given scenario, option 3 indicates a risk because the father has Rh positive blood, which can potentially expose the