Child death may occur in the marriage between :

Options

A. `Rh^+` man and `RH^+` woman
B. `Rh^+` man and `RH^-` woman
C. `Rh^-` man and `RH^-` woman
D. `Rh^-` man and `RH^+` woman

Answer

To solve the question regarding child death in marriages based on Rh factor compatibility, we will analyze the different combinations of Rh positive and Rh negative individuals.

### Step-by-Step Solution:

1. **Understand Rh Factor**:
- The Rh factor is a protein that can be present on the surface of red blood cells. Individuals with this protein are classified as Rh positive (Rh+), while those without it are classified as Rh negative (Rh-).

2. **Identify the Problem**:
- The question is concerned with a condition known as Erythroblastosis Fetalis, which can occur when there is an incompatibility between the Rh factors of the mother and the fetus.

3. **Analyze Each Combination**:
- **Rh+ man and Rh+ woman**: Both parents are Rh positive. The child will also be Rh positive. No risk of Erythroblastosis Fetalis.
- **Rh+ man and Rh- woman**: The father is Rh positive, and the mother is Rh negative. If the child inherits the Rh positive trait from the father, the mother’s body may produce antibodies against the Rh factor during delivery, leading to complications in subsequent pregnancies.
- **Rh- man and Rh- woman**: Both parents are Rh negative. The child will also be Rh negative. No risk of Erythroblastosis Fetalis.
- **Rh- man and Rh+ woman**: The mother is Rh positive, and the father is Rh negative. The child will be Rh positive, but the mother will not produce antibodies against the Rh factor, so there is no risk of Erythroblastosis Fetalis.
- **Rh+ woman and Rh- man**: Similar to the previous case, the mother is Rh positive, and the father is Rh negative, leading to no risk.

4. **Conclusion**:
- The only scenario where child death may occur due to Rh incompatibility is when the father is Rh positive and the mother is Rh negative. This leads to the formation of antibodies in the mother that can harm the fetus in subsequent pregnancies.

### Final Answer:
- Child death may occur in the marriage between **Rh positive men and Rh negative women**.